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+/**
+ * @license
+ * lodash 3.10.1 (Custom Build) <https://lodash.com/>
+ * Build: `lodash modern -d -o ./index.js`
+ * Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
+ * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
+ * Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
+ * Available under MIT license <https://lodash.com/license>
+ */
+;(function() {
+
+ /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+ var undefined;
+
+ /** Used as the semantic version number. */
+ var VERSION = '3.10.1';
+
+ /** Used to compose bitmasks for wrapper metadata. */
+ var BIND_FLAG = 1,
+ BIND_KEY_FLAG = 2,
+ CURRY_BOUND_FLAG = 4,
+ CURRY_FLAG = 8,
+ CURRY_RIGHT_FLAG = 16,
+ PARTIAL_FLAG = 32,
+ PARTIAL_RIGHT_FLAG = 64,
+ ARY_FLAG = 128,
+ REARG_FLAG = 256;
+
+ /** Used as default options for `_.trunc`. */
+ var DEFAULT_TRUNC_LENGTH = 30,
+ DEFAULT_TRUNC_OMISSION = '...';
+
+ /** Used to detect when a function becomes hot. */
+ var HOT_COUNT = 150,
+ HOT_SPAN = 16;
+
+ /** Used as the size to enable large array optimizations. */
+ var LARGE_ARRAY_SIZE = 200;
+
+ /** Used to indicate the type of lazy iteratees. */
+ var LAZY_FILTER_FLAG = 1,
+ LAZY_MAP_FLAG = 2;
+
+ /** Used as the `TypeError` message for "Functions" methods. */
+ var FUNC_ERROR_TEXT = 'Expected a function';
+
+ /** Used as the internal argument placeholder. */
+ var PLACEHOLDER = '__lodash_placeholder__';
+
+ /** `Object#toString` result references. */
+ var argsTag = '[object Arguments]',
+ arrayTag = '[object Array]',
+ boolTag = '[object Boolean]',
+ dateTag = '[object Date]',
+ errorTag = '[object Error]',
+ funcTag = '[object Function]',
+ mapTag = '[object Map]',
+ numberTag = '[object Number]',
+ objectTag = '[object Object]',
+ regexpTag = '[object RegExp]',
+ setTag = '[object Set]',
+ stringTag = '[object String]',
+ weakMapTag = '[object WeakMap]';
+
+ var arrayBufferTag = '[object ArrayBuffer]',
+ float32Tag = '[object Float32Array]',
+ float64Tag = '[object Float64Array]',
+ int8Tag = '[object Int8Array]',
+ int16Tag = '[object Int16Array]',
+ int32Tag = '[object Int32Array]',
+ uint8Tag = '[object Uint8Array]',
+ uint8ClampedTag = '[object Uint8ClampedArray]',
+ uint16Tag = '[object Uint16Array]',
+ uint32Tag = '[object Uint32Array]';
+
+ /** Used to match empty string literals in compiled template source. */
+ var reEmptyStringLeading = /\b__p \+= '';/g,
+ reEmptyStringMiddle = /\b(__p \+=) '' \+/g,
+ reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g;
+
+ /** Used to match HTML entities and HTML characters. */
+ var reEscapedHtml = /&(?:amp|lt|gt|quot|#39|#96);/g,
+ reUnescapedHtml = /[&<>"'`]/g,
+ reHasEscapedHtml = RegExp(reEscapedHtml.source),
+ reHasUnescapedHtml = RegExp(reUnescapedHtml.source);
+
+ /** Used to match template delimiters. */
+ var reEscape = /<%-([\s\S]+?)%>/g,
+ reEvaluate = /<%([\s\S]+?)%>/g,
+ reInterpolate = /<%=([\s\S]+?)%>/g;
+
+ /** Used to match property names within property paths. */
+ var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\n\\]|\\.)*?\1)\]/,
+ reIsPlainProp = /^\w*$/,
+ rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\n\\]|\\.)*?)\2)\]/g;
+
+ /**
+ * Used to match `RegExp` [syntax characters](http://ecma-international.org/ecma-262/6.0/#sec-patterns)
+ * and those outlined by [`EscapeRegExpPattern`](http://ecma-international.org/ecma-262/6.0/#sec-escaperegexppattern).
+ */
+ var reRegExpChars = /^[:!,]|[\\^$.*+?()[\]{}|\/]|(^[0-9a-fA-Fnrtuvx])|([\n\r\u2028\u2029])/g,
+ reHasRegExpChars = RegExp(reRegExpChars.source);
+
+ /** Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks). */
+ var reComboMark = /[\u0300-\u036f\ufe20-\ufe23]/g;
+
+ /** Used to match backslashes in property paths. */
+ var reEscapeChar = /\\(\\)?/g;
+
+ /** Used to match [ES template delimiters](http://ecma-international.org/ecma-262/6.0/#sec-template-literal-lexical-components). */
+ var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;
+
+ /** Used to match `RegExp` flags from their coerced string values. */
+ var reFlags = /\w*$/;
+
+ /** Used to detect hexadecimal string values. */
+ var reHasHexPrefix = /^0[xX]/;
+
+ /** Used to detect host constructors (Safari > 5). */
+ var reIsHostCtor = /^\[object .+?Constructor\]$/;
+
+ /** Used to detect unsigned integer values. */
+ var reIsUint = /^\d+$/;
+
+ /** Used to match latin-1 supplementary letters (excluding mathematical operators). */
+ var reLatin1 = /[\xc0-\xd6\xd8-\xde\xdf-\xf6\xf8-\xff]/g;
+
+ /** Used to ensure capturing order of template delimiters. */
+ var reNoMatch = /($^)/;
+
+ /** Used to match unescaped characters in compiled string literals. */
+ var reUnescapedString = /['\n\r\u2028\u2029\\]/g;
+
+ /** Used to match words to create compound words. */
+ var reWords = (function() {
+ var upper = '[A-Z\\xc0-\\xd6\\xd8-\\xde]',
+ lower = '[a-z\\xdf-\\xf6\\xf8-\\xff]+';
+
+ return RegExp(upper + '+(?=' + upper + lower + ')|' + upper + '?' + lower + '|' + upper + '+|[0-9]+', 'g');
+ }());
+
+ /** Used to assign default `context` object properties. */
+ var contextProps = [
+ 'Array', 'ArrayBuffer', 'Date', 'Error', 'Float32Array', 'Float64Array',
+ 'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Math', 'Number',
+ 'Object', 'RegExp', 'Set', 'String', '_', 'clearTimeout', 'isFinite',
+ 'parseFloat', 'parseInt', 'setTimeout', 'TypeError', 'Uint8Array',
+ 'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap'
+ ];
+
+ /** Used to make template sourceURLs easier to identify. */
+ var templateCounter = -1;
+
+ /** Used to identify `toStringTag` values of typed arrays. */
+ var typedArrayTags = {};
+ typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
+ typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
+ typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
+ typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
+ typedArrayTags[uint32Tag] = true;
+ typedArrayTags[argsTag] = typedArrayTags[arrayTag] =
+ typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
+ typedArrayTags[dateTag] = typedArrayTags[errorTag] =
+ typedArrayTags[funcTag] = typedArrayTags[mapTag] =
+ typedArrayTags[numberTag] = typedArrayTags[objectTag] =
+ typedArrayTags[regexpTag] = typedArrayTags[setTag] =
+ typedArrayTags[stringTag] = typedArrayTags[weakMapTag] = false;
+
+ /** Used to identify `toStringTag` values supported by `_.clone`. */
+ var cloneableTags = {};
+ cloneableTags[argsTag] = cloneableTags[arrayTag] =
+ cloneableTags[arrayBufferTag] = cloneableTags[boolTag] =
+ cloneableTags[dateTag] = cloneableTags[float32Tag] =
+ cloneableTags[float64Tag] = cloneableTags[int8Tag] =
+ cloneableTags[int16Tag] = cloneableTags[int32Tag] =
+ cloneableTags[numberTag] = cloneableTags[objectTag] =
+ cloneableTags[regexpTag] = cloneableTags[stringTag] =
+ cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
+ cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
+ cloneableTags[errorTag] = cloneableTags[funcTag] =
+ cloneableTags[mapTag] = cloneableTags[setTag] =
+ cloneableTags[weakMapTag] = false;
+
+ /** Used to map latin-1 supplementary letters to basic latin letters. */
+ var deburredLetters = {
+ '\xc0': 'A', '\xc1': 'A', '\xc2': 'A', '\xc3': 'A', '\xc4': 'A', '\xc5': 'A',
+ '\xe0': 'a', '\xe1': 'a', '\xe2': 'a', '\xe3': 'a', '\xe4': 'a', '\xe5': 'a',
+ '\xc7': 'C', '\xe7': 'c',
+ '\xd0': 'D', '\xf0': 'd',
+ '\xc8': 'E', '\xc9': 'E', '\xca': 'E', '\xcb': 'E',
+ '\xe8': 'e', '\xe9': 'e', '\xea': 'e', '\xeb': 'e',
+ '\xcC': 'I', '\xcd': 'I', '\xce': 'I', '\xcf': 'I',
+ '\xeC': 'i', '\xed': 'i', '\xee': 'i', '\xef': 'i',
+ '\xd1': 'N', '\xf1': 'n',
+ '\xd2': 'O', '\xd3': 'O', '\xd4': 'O', '\xd5': 'O', '\xd6': 'O', '\xd8': 'O',
+ '\xf2': 'o', '\xf3': 'o', '\xf4': 'o', '\xf5': 'o', '\xf6': 'o', '\xf8': 'o',
+ '\xd9': 'U', '\xda': 'U', '\xdb': 'U', '\xdc': 'U',
+ '\xf9': 'u', '\xfa': 'u', '\xfb': 'u', '\xfc': 'u',
+ '\xdd': 'Y', '\xfd': 'y', '\xff': 'y',
+ '\xc6': 'Ae', '\xe6': 'ae',
+ '\xde': 'Th', '\xfe': 'th',
+ '\xdf': 'ss'
+ };
+
+ /** Used to map characters to HTML entities. */
+ var htmlEscapes = {
+ '&': '&amp;',
+ '<': '&lt;',
+ '>': '&gt;',
+ '"': '&quot;',
+ "'": '&#39;',
+ '`': '&#96;'
+ };
+
+ /** Used to map HTML entities to characters. */
+ var htmlUnescapes = {
+ '&amp;': '&',
+ '&lt;': '<',
+ '&gt;': '>',
+ '&quot;': '"',
+ '&#39;': "'",
+ '&#96;': '`'
+ };
+
+ /** Used to determine if values are of the language type `Object`. */
+ var objectTypes = {
+ 'function': true,
+ 'object': true
+ };
+
+ /** Used to escape characters for inclusion in compiled regexes. */
+ var regexpEscapes = {
+ '0': 'x30', '1': 'x31', '2': 'x32', '3': 'x33', '4': 'x34',
+ '5': 'x35', '6': 'x36', '7': 'x37', '8': 'x38', '9': 'x39',
+ 'A': 'x41', 'B': 'x42', 'C': 'x43', 'D': 'x44', 'E': 'x45', 'F': 'x46',
+ 'a': 'x61', 'b': 'x62', 'c': 'x63', 'd': 'x64', 'e': 'x65', 'f': 'x66',
+ 'n': 'x6e', 'r': 'x72', 't': 'x74', 'u': 'x75', 'v': 'x76', 'x': 'x78'
+ };
+
+ /** Used to escape characters for inclusion in compiled string literals. */
+ var stringEscapes = {
+ '\\': '\\',
+ "'": "'",
+ '\n': 'n',
+ '\r': 'r',
+ '\u2028': 'u2028',
+ '\u2029': 'u2029'
+ };
+
+ /** Detect free variable `exports`. */
+ var freeExports = objectTypes[typeof exports] && exports && !exports.nodeType && exports;
+
+ /** Detect free variable `module`. */
+ var freeModule = objectTypes[typeof module] && module && !module.nodeType && module;
+
+ /** Detect free variable `global` from Node.js. */
+ var freeGlobal = freeExports && freeModule && typeof global == 'object' && global && global.Object && global;
+
+ /** Detect free variable `self`. */
+ var freeSelf = objectTypes[typeof self] && self && self.Object && self;
+
+ /** Detect free variable `window`. */
+ var freeWindow = objectTypes[typeof window] && window && window.Object && window;
+
+ /** Detect the popular CommonJS extension `module.exports`. */
+ var moduleExports = freeModule && freeModule.exports === freeExports && freeExports;
+
+ /**
+ * Used as a reference to the global object.
+ *
+ * The `this` value is used if it's the global object to avoid Greasemonkey's
+ * restricted `window` object, otherwise the `window` object is used.
+ */
+ var root = freeGlobal || ((freeWindow !== (this && this.window)) && freeWindow) || freeSelf || this;
+
+ /*--------------------------------------------------------------------------*/
+
+ /**
+ * The base implementation of `compareAscending` which compares values and
+ * sorts them in ascending order without guaranteeing a stable sort.
+ *
+ * @private
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {number} Returns the sort order indicator for `value`.
+ */
+ function baseCompareAscending(value, other) {
+ if (value !== other) {
+ var valIsNull = value === null,
+ valIsUndef = value === undefined,
+ valIsReflexive = value === value;
+
+ var othIsNull = other === null,
+ othIsUndef = other === undefined,
+ othIsReflexive = other === other;
+
+ if ((value > other && !othIsNull) || !valIsReflexive ||
+ (valIsNull && !othIsUndef && othIsReflexive) ||
+ (valIsUndef && othIsReflexive)) {
+ return 1;
+ }
+ if ((value < other && !valIsNull) || !othIsReflexive ||
+ (othIsNull && !valIsUndef && valIsReflexive) ||
+ (othIsUndef && valIsReflexive)) {
+ return -1;
+ }
+ }
+ return 0;
+ }
+
+ /**
+ * The base implementation of `_.findIndex` and `_.findLastIndex` without
+ * support for callback shorthands and `this` binding.
+ *
+ * @private
+ * @param {Array} array The array to search.
+ * @param {Function} predicate The function invoked per iteration.
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+ function baseFindIndex(array, predicate, fromRight) {
+ var length = array.length,
+ index = fromRight ? length : -1;
+
+ while ((fromRight ? index-- : ++index < length)) {
+ if (predicate(array[index], index, array)) {
+ return index;
+ }
+ }
+ return -1;
+ }
+
+ /**
+ * The base implementation of `_.indexOf` without support for binary searches.
+ *
+ * @private
+ * @param {Array} array The array to search.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+ function baseIndexOf(array, value, fromIndex) {
+ if (value !== value) {
+ return indexOfNaN(array, fromIndex);
+ }
+ var index = fromIndex - 1,
+ length = array.length;
+
+ while (++index < length) {
+ if (array[index] === value) {
+ return index;
+ }
+ }
+ return -1;
+ }
+
+ /**
+ * The base implementation of `_.isFunction` without support for environments
+ * with incorrect `typeof` results.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ */
+ function baseIsFunction(value) {
+ // Avoid a Chakra JIT bug in compatibility modes of IE 11.
+ // See https://github.com/jashkenas/underscore/issues/1621 for more details.
+ return typeof value == 'function' || false;
+ }
+
+ /**
+ * Converts `value` to a string if it's not one. An empty string is returned
+ * for `null` or `undefined` values.
+ *
+ * @private
+ * @param {*} value The value to process.
+ * @returns {string} Returns the string.
+ */
+ function baseToString(value) {
+ return value == null ? '' : (value + '');
+ }
+
+ /**
+ * Used by `_.trim` and `_.trimLeft` to get the index of the first character
+ * of `string` that is not found in `chars`.
+ *
+ * @private
+ * @param {string} string The string to inspect.
+ * @param {string} chars The characters to find.
+ * @returns {number} Returns the index of the first character not found in `chars`.
+ */
+ function charsLeftIndex(string, chars) {
+ var index = -1,
+ length = string.length;
+
+ while (++index < length && chars.indexOf(string.charAt(index)) > -1) {}
+ return index;
+ }
+
+ /**
+ * Used by `_.trim` and `_.trimRight` to get the index of the last character
+ * of `string` that is not found in `chars`.
+ *
+ * @private
+ * @param {string} string The string to inspect.
+ * @param {string} chars The characters to find.
+ * @returns {number} Returns the index of the last character not found in `chars`.
+ */
+ function charsRightIndex(string, chars) {
+ var index = string.length;
+
+ while (index-- && chars.indexOf(string.charAt(index)) > -1) {}
+ return index;
+ }
+
+ /**
+ * Used by `_.sortBy` to compare transformed elements of a collection and stable
+ * sort them in ascending order.
+ *
+ * @private
+ * @param {Object} object The object to compare.
+ * @param {Object} other The other object to compare.
+ * @returns {number} Returns the sort order indicator for `object`.
+ */
+ function compareAscending(object, other) {
+ return baseCompareAscending(object.criteria, other.criteria) || (object.index - other.index);
+ }
+
+ /**
+ * Used by `_.sortByOrder` to compare multiple properties of a value to another
+ * and stable sort them.
+ *
+ * If `orders` is unspecified, all valuess are sorted in ascending order. Otherwise,
+ * a value is sorted in ascending order if its corresponding order is "asc", and
+ * descending if "desc".
+ *
+ * @private
+ * @param {Object} object The object to compare.
+ * @param {Object} other The other object to compare.
+ * @param {boolean[]} orders The order to sort by for each property.
+ * @returns {number} Returns the sort order indicator for `object`.
+ */
+ function compareMultiple(object, other, orders) {
+ var index = -1,
+ objCriteria = object.criteria,
+ othCriteria = other.criteria,
+ length = objCriteria.length,
+ ordersLength = orders.length;
+
+ while (++index < length) {
+ var result = baseCompareAscending(objCriteria[index], othCriteria[index]);
+ if (result) {
+ if (index >= ordersLength) {
+ return result;
+ }
+ var order = orders[index];
+ return result * ((order === 'asc' || order === true) ? 1 : -1);
+ }
+ }
+ // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
+ // that causes it, under certain circumstances, to provide the same value for
+ // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
+ // for more details.
+ //
+ // This also ensures a stable sort in V8 and other engines.
+ // See https://code.google.com/p/v8/issues/detail?id=90 for more details.
+ return object.index - other.index;
+ }
+
+ /**
+ * Used by `_.deburr` to convert latin-1 supplementary letters to basic latin letters.
+ *
+ * @private
+ * @param {string} letter The matched letter to deburr.
+ * @returns {string} Returns the deburred letter.
+ */
+ function deburrLetter(letter) {
+ return deburredLetters[letter];
+ }
+
+ /**
+ * Used by `_.escape` to convert characters to HTML entities.
+ *
+ * @private
+ * @param {string} chr The matched character to escape.
+ * @returns {string} Returns the escaped character.
+ */
+ function escapeHtmlChar(chr) {
+ return htmlEscapes[chr];
+ }
+
+ /**
+ * Used by `_.escapeRegExp` to escape characters for inclusion in compiled regexes.
+ *
+ * @private
+ * @param {string} chr The matched character to escape.
+ * @param {string} leadingChar The capture group for a leading character.
+ * @param {string} whitespaceChar The capture group for a whitespace character.
+ * @returns {string} Returns the escaped character.
+ */
+ function escapeRegExpChar(chr, leadingChar, whitespaceChar) {
+ if (leadingChar) {
+ chr = regexpEscapes[chr];
+ } else if (whitespaceChar) {
+ chr = stringEscapes[chr];
+ }
+ return '\\' + chr;
+ }
+
+ /**
+ * Used by `_.template` to escape characters for inclusion in compiled string literals.
+ *
+ * @private
+ * @param {string} chr The matched character to escape.
+ * @returns {string} Returns the escaped character.
+ */
+ function escapeStringChar(chr) {
+ return '\\' + stringEscapes[chr];
+ }
+
+ /**
+ * Gets the index at which the first occurrence of `NaN` is found in `array`.
+ *
+ * @private
+ * @param {Array} array The array to search.
+ * @param {number} fromIndex The index to search from.
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {number} Returns the index of the matched `NaN`, else `-1`.
+ */
+ function indexOfNaN(array, fromIndex, fromRight) {
+ var length = array.length,
+ index = fromIndex + (fromRight ? 0 : -1);
+
+ while ((fromRight ? index-- : ++index < length)) {
+ var other = array[index];
+ if (other !== other) {
+ return index;
+ }
+ }
+ return -1;
+ }
+
+ /**
+ * Checks if `value` is object-like.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
+ */
+ function isObjectLike(value) {
+ return !!value && typeof value == 'object';
+ }
+
+ /**
+ * Used by `trimmedLeftIndex` and `trimmedRightIndex` to determine if a
+ * character code is whitespace.
+ *
+ * @private
+ * @param {number} charCode The character code to inspect.
+ * @returns {boolean} Returns `true` if `charCode` is whitespace, else `false`.
+ */
+ function isSpace(charCode) {
+ return ((charCode <= 160 && (charCode >= 9 && charCode <= 13) || charCode == 32 || charCode == 160) || charCode == 5760 || charCode == 6158 ||
+ (charCode >= 8192 && (charCode <= 8202 || charCode == 8232 || charCode == 8233 || charCode == 8239 || charCode == 8287 || charCode == 12288 || charCode == 65279)));
+ }
+
+ /**
+ * Replaces all `placeholder` elements in `array` with an internal placeholder
+ * and returns an array of their indexes.
+ *
+ * @private
+ * @param {Array} array The array to modify.
+ * @param {*} placeholder The placeholder to replace.
+ * @returns {Array} Returns the new array of placeholder indexes.
+ */
+ function replaceHolders(array, placeholder) {
+ var index = -1,
+ length = array.length,
+ resIndex = -1,
+ result = [];
+
+ while (++index < length) {
+ if (array[index] === placeholder) {
+ array[index] = PLACEHOLDER;
+ result[++resIndex] = index;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * An implementation of `_.uniq` optimized for sorted arrays without support
+ * for callback shorthands and `this` binding.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {Function} [iteratee] The function invoked per iteration.
+ * @returns {Array} Returns the new duplicate-value-free array.
+ */
+ function sortedUniq(array, iteratee) {
+ var seen,
+ index = -1,
+ length = array.length,
+ resIndex = -1,
+ result = [];
+
+ while (++index < length) {
+ var value = array[index],
+ computed = iteratee ? iteratee(value, index, array) : value;
+
+ if (!index || seen !== computed) {
+ seen = computed;
+ result[++resIndex] = value;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Used by `_.trim` and `_.trimLeft` to get the index of the first non-whitespace
+ * character of `string`.
+ *
+ * @private
+ * @param {string} string The string to inspect.
+ * @returns {number} Returns the index of the first non-whitespace character.
+ */
+ function trimmedLeftIndex(string) {
+ var index = -1,
+ length = string.length;
+
+ while (++index < length && isSpace(string.charCodeAt(index))) {}
+ return index;
+ }
+
+ /**
+ * Used by `_.trim` and `_.trimRight` to get the index of the last non-whitespace
+ * character of `string`.
+ *
+ * @private
+ * @param {string} string The string to inspect.
+ * @returns {number} Returns the index of the last non-whitespace character.
+ */
+ function trimmedRightIndex(string) {
+ var index = string.length;
+
+ while (index-- && isSpace(string.charCodeAt(index))) {}
+ return index;
+ }
+
+ /**
+ * Used by `_.unescape` to convert HTML entities to characters.
+ *
+ * @private
+ * @param {string} chr The matched character to unescape.
+ * @returns {string} Returns the unescaped character.
+ */
+ function unescapeHtmlChar(chr) {
+ return htmlUnescapes[chr];
+ }
+
+ /*--------------------------------------------------------------------------*/
+
+ /**
+ * Create a new pristine `lodash` function using the given `context` object.
+ *
+ * @static
+ * @memberOf _
+ * @category Utility
+ * @param {Object} [context=root] The context object.
+ * @returns {Function} Returns a new `lodash` function.
+ * @example
+ *
+ * _.mixin({ 'foo': _.constant('foo') });
+ *
+ * var lodash = _.runInContext();
+ * lodash.mixin({ 'bar': lodash.constant('bar') });
+ *
+ * _.isFunction(_.foo);
+ * // => true
+ * _.isFunction(_.bar);
+ * // => false
+ *
+ * lodash.isFunction(lodash.foo);
+ * // => false
+ * lodash.isFunction(lodash.bar);
+ * // => true
+ *
+ * // using `context` to mock `Date#getTime` use in `_.now`
+ * var mock = _.runInContext({
+ * 'Date': function() {
+ * return { 'getTime': getTimeMock };
+ * }
+ * });
+ *
+ * // or creating a suped-up `defer` in Node.js
+ * var defer = _.runInContext({ 'setTimeout': setImmediate }).defer;
+ */
+ function runInContext(context) {
+ // Avoid issues with some ES3 environments that attempt to use values, named
+ // after built-in constructors like `Object`, for the creation of literals.
+ // ES5 clears this up by stating that literals must use built-in constructors.
+ // See https://es5.github.io/#x11.1.5 for more details.
+ context = context ? _.defaults(root.Object(), context, _.pick(root, contextProps)) : root;
+
+ /** Native constructor references. */
+ var Array = context.Array,
+ Date = context.Date,
+ Error = context.Error,
+ Function = context.Function,
+ Math = context.Math,
+ Number = context.Number,
+ Object = context.Object,
+ RegExp = context.RegExp,
+ String = context.String,
+ TypeError = context.TypeError;
+
+ /** Used for native method references. */
+ var arrayProto = Array.prototype,
+ objectProto = Object.prototype,
+ stringProto = String.prototype;
+
+ /** Used to resolve the decompiled source of functions. */
+ var fnToString = Function.prototype.toString;
+
+ /** Used to check objects for own properties. */
+ var hasOwnProperty = objectProto.hasOwnProperty;
+
+ /** Used to generate unique IDs. */
+ var idCounter = 0;
+
+ /**
+ * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+ var objToString = objectProto.toString;
+
+ /** Used to restore the original `_` reference in `_.noConflict`. */
+ var oldDash = root._;
+
+ /** Used to detect if a method is native. */
+ var reIsNative = RegExp('^' +
+ fnToString.call(hasOwnProperty).replace(/[\\^$.*+?()[\]{}|]/g, '\\$&')
+ .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
+ );
+
+ /** Native method references. */
+ var ArrayBuffer = context.ArrayBuffer,
+ clearTimeout = context.clearTimeout,
+ parseFloat = context.parseFloat,
+ pow = Math.pow,
+ propertyIsEnumerable = objectProto.propertyIsEnumerable,
+ Set = getNative(context, 'Set'),
+ setTimeout = context.setTimeout,
+ splice = arrayProto.splice,
+ Uint8Array = context.Uint8Array,
+ WeakMap = getNative(context, 'WeakMap');
+
+ /* Native method references for those with the same name as other `lodash` methods. */
+ var nativeCeil = Math.ceil,
+ nativeCreate = getNative(Object, 'create'),
+ nativeFloor = Math.floor,
+ nativeIsArray = getNative(Array, 'isArray'),
+ nativeIsFinite = context.isFinite,
+ nativeKeys = getNative(Object, 'keys'),
+ nativeMax = Math.max,
+ nativeMin = Math.min,
+ nativeNow = getNative(Date, 'now'),
+ nativeParseInt = context.parseInt,
+ nativeRandom = Math.random;
+
+ /** Used as references for `-Infinity` and `Infinity`. */
+ var NEGATIVE_INFINITY = Number.NEGATIVE_INFINITY,
+ POSITIVE_INFINITY = Number.POSITIVE_INFINITY;
+
+ /** Used as references for the maximum length and index of an array. */
+ var MAX_ARRAY_LENGTH = 4294967295,
+ MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1,
+ HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1;
+
+ /**
+ * Used as the [maximum length](http://ecma-international.org/ecma-262/6.0/#sec-number.max_safe_integer)
+ * of an array-like value.
+ */
+ var MAX_SAFE_INTEGER = 9007199254740991;
+
+ /** Used to store function metadata. */
+ var metaMap = WeakMap && new WeakMap;
+
+ /** Used to lookup unminified function names. */
+ var realNames = {};
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates a `lodash` object which wraps `value` to enable implicit chaining.
+ * Methods that operate on and return arrays, collections, and functions can
+ * be chained together. Methods that retrieve a single value or may return a
+ * primitive value will automatically end the chain returning the unwrapped
+ * value. Explicit chaining may be enabled using `_.chain`. The execution of
+ * chained methods is lazy, that is, execution is deferred until `_#value`
+ * is implicitly or explicitly called.
+ *
+ * Lazy evaluation allows several methods to support shortcut fusion. Shortcut
+ * fusion is an optimization strategy which merge iteratee calls; this can help
+ * to avoid the creation of intermediate data structures and greatly reduce the
+ * number of iteratee executions.
+ *
+ * Chaining is supported in custom builds as long as the `_#value` method is
+ * directly or indirectly included in the build.
+ *
+ * In addition to lodash methods, wrappers have `Array` and `String` methods.
+ *
+ * The wrapper `Array` methods are:
+ * `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`,
+ * `splice`, and `unshift`
+ *
+ * The wrapper `String` methods are:
+ * `replace` and `split`
+ *
+ * The wrapper methods that support shortcut fusion are:
+ * `compact`, `drop`, `dropRight`, `dropRightWhile`, `dropWhile`, `filter`,
+ * `first`, `initial`, `last`, `map`, `pluck`, `reject`, `rest`, `reverse`,
+ * `slice`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, `toArray`,
+ * and `where`
+ *
+ * The chainable wrapper methods are:
+ * `after`, `ary`, `assign`, `at`, `before`, `bind`, `bindAll`, `bindKey`,
+ * `callback`, `chain`, `chunk`, `commit`, `compact`, `concat`, `constant`,
+ * `countBy`, `create`, `curry`, `debounce`, `defaults`, `defaultsDeep`,
+ * `defer`, `delay`, `difference`, `drop`, `dropRight`, `dropRightWhile`,
+ * `dropWhile`, `fill`, `filter`, `flatten`, `flattenDeep`, `flow`, `flowRight`,
+ * `forEach`, `forEachRight`, `forIn`, `forInRight`, `forOwn`, `forOwnRight`,
+ * `functions`, `groupBy`, `indexBy`, `initial`, `intersection`, `invert`,
+ * `invoke`, `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, `matches`,
+ * `matchesProperty`, `memoize`, `merge`, `method`, `methodOf`, `mixin`,
+ * `modArgs`, `negate`, `omit`, `once`, `pairs`, `partial`, `partialRight`,
+ * `partition`, `pick`, `plant`, `pluck`, `property`, `propertyOf`, `pull`,
+ * `pullAt`, `push`, `range`, `rearg`, `reject`, `remove`, `rest`, `restParam`,
+ * `reverse`, `set`, `shuffle`, `slice`, `sort`, `sortBy`, `sortByAll`,
+ * `sortByOrder`, `splice`, `spread`, `take`, `takeRight`, `takeRightWhile`,
+ * `takeWhile`, `tap`, `throttle`, `thru`, `times`, `toArray`, `toPlainObject`,
+ * `transform`, `union`, `uniq`, `unshift`, `unzip`, `unzipWith`, `values`,
+ * `valuesIn`, `where`, `without`, `wrap`, `xor`, `zip`, `zipObject`, `zipWith`
+ *
+ * The wrapper methods that are **not** chainable by default are:
+ * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clone`, `cloneDeep`,
+ * `deburr`, `endsWith`, `escape`, `escapeRegExp`, `every`, `find`, `findIndex`,
+ * `findKey`, `findLast`, `findLastIndex`, `findLastKey`, `findWhere`, `first`,
+ * `floor`, `get`, `gt`, `gte`, `has`, `identity`, `includes`, `indexOf`,
+ * `inRange`, `isArguments`, `isArray`, `isBoolean`, `isDate`, `isElement`,
+ * `isEmpty`, `isEqual`, `isError`, `isFinite` `isFunction`, `isMatch`,
+ * `isNative`, `isNaN`, `isNull`, `isNumber`, `isObject`, `isPlainObject`,
+ * `isRegExp`, `isString`, `isUndefined`, `isTypedArray`, `join`, `kebabCase`,
+ * `last`, `lastIndexOf`, `lt`, `lte`, `max`, `min`, `noConflict`, `noop`,
+ * `now`, `pad`, `padLeft`, `padRight`, `parseInt`, `pop`, `random`, `reduce`,
+ * `reduceRight`, `repeat`, `result`, `round`, `runInContext`, `shift`, `size`,
+ * `snakeCase`, `some`, `sortedIndex`, `sortedLastIndex`, `startCase`,
+ * `startsWith`, `sum`, `template`, `trim`, `trimLeft`, `trimRight`, `trunc`,
+ * `unescape`, `uniqueId`, `value`, and `words`
+ *
+ * The wrapper method `sample` will return a wrapped value when `n` is provided,
+ * otherwise an unwrapped value is returned.
+ *
+ * @name _
+ * @constructor
+ * @category Chain
+ * @param {*} value The value to wrap in a `lodash` instance.
+ * @returns {Object} Returns the new `lodash` wrapper instance.
+ * @example
+ *
+ * var wrapped = _([1, 2, 3]);
+ *
+ * // returns an unwrapped value
+ * wrapped.reduce(function(total, n) {
+ * return total + n;
+ * });
+ * // => 6
+ *
+ * // returns a wrapped value
+ * var squares = wrapped.map(function(n) {
+ * return n * n;
+ * });
+ *
+ * _.isArray(squares);
+ * // => false
+ *
+ * _.isArray(squares.value());
+ * // => true
+ */
+ function lodash(value) {
+ if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) {
+ if (value instanceof LodashWrapper) {
+ return value;
+ }
+ if (hasOwnProperty.call(value, '__chain__') && hasOwnProperty.call(value, '__wrapped__')) {
+ return wrapperClone(value);
+ }
+ }
+ return new LodashWrapper(value);
+ }
+
+ /**
+ * The function whose prototype all chaining wrappers inherit from.
+ *
+ * @private
+ */
+ function baseLodash() {
+ // No operation performed.
+ }
+
+ /**
+ * The base constructor for creating `lodash` wrapper objects.
+ *
+ * @private
+ * @param {*} value The value to wrap.
+ * @param {boolean} [chainAll] Enable chaining for all wrapper methods.
+ * @param {Array} [actions=[]] Actions to peform to resolve the unwrapped value.
+ */
+ function LodashWrapper(value, chainAll, actions) {
+ this.__wrapped__ = value;
+ this.__actions__ = actions || [];
+ this.__chain__ = !!chainAll;
+ }
+
+ /**
+ * An object environment feature flags.
+ *
+ * @static
+ * @memberOf _
+ * @type Object
+ */
+ var support = lodash.support = {};
+
+ /**
+ * By default, the template delimiters used by lodash are like those in
+ * embedded Ruby (ERB). Change the following template settings to use
+ * alternative delimiters.
+ *
+ * @static
+ * @memberOf _
+ * @type Object
+ */
+ lodash.templateSettings = {
+
+ /**
+ * Used to detect `data` property values to be HTML-escaped.
+ *
+ * @memberOf _.templateSettings
+ * @type RegExp
+ */
+ 'escape': reEscape,
+
+ /**
+ * Used to detect code to be evaluated.
+ *
+ * @memberOf _.templateSettings
+ * @type RegExp
+ */
+ 'evaluate': reEvaluate,
+
+ /**
+ * Used to detect `data` property values to inject.
+ *
+ * @memberOf _.templateSettings
+ * @type RegExp
+ */
+ 'interpolate': reInterpolate,
+
+ /**
+ * Used to reference the data object in the template text.
+ *
+ * @memberOf _.templateSettings
+ * @type string
+ */
+ 'variable': '',
+
+ /**
+ * Used to import variables into the compiled template.
+ *
+ * @memberOf _.templateSettings
+ * @type Object
+ */
+ 'imports': {
+
+ /**
+ * A reference to the `lodash` function.
+ *
+ * @memberOf _.templateSettings.imports
+ * @type Function
+ */
+ '_': lodash
+ }
+ };
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation.
+ *
+ * @private
+ * @param {*} value The value to wrap.
+ */
+ function LazyWrapper(value) {
+ this.__wrapped__ = value;
+ this.__actions__ = [];
+ this.__dir__ = 1;
+ this.__filtered__ = false;
+ this.__iteratees__ = [];
+ this.__takeCount__ = POSITIVE_INFINITY;
+ this.__views__ = [];
+ }
+
+ /**
+ * Creates a clone of the lazy wrapper object.
+ *
+ * @private
+ * @name clone
+ * @memberOf LazyWrapper
+ * @returns {Object} Returns the cloned `LazyWrapper` object.
+ */
+ function lazyClone() {
+ var result = new LazyWrapper(this.__wrapped__);
+ result.__actions__ = arrayCopy(this.__actions__);
+ result.__dir__ = this.__dir__;
+ result.__filtered__ = this.__filtered__;
+ result.__iteratees__ = arrayCopy(this.__iteratees__);
+ result.__takeCount__ = this.__takeCount__;
+ result.__views__ = arrayCopy(this.__views__);
+ return result;
+ }
+
+ /**
+ * Reverses the direction of lazy iteration.
+ *
+ * @private
+ * @name reverse
+ * @memberOf LazyWrapper
+ * @returns {Object} Returns the new reversed `LazyWrapper` object.
+ */
+ function lazyReverse() {
+ if (this.__filtered__) {
+ var result = new LazyWrapper(this);
+ result.__dir__ = -1;
+ result.__filtered__ = true;
+ } else {
+ result = this.clone();
+ result.__dir__ *= -1;
+ }
+ return result;
+ }
+
+ /**
+ * Extracts the unwrapped value from its lazy wrapper.
+ *
+ * @private
+ * @name value
+ * @memberOf LazyWrapper
+ * @returns {*} Returns the unwrapped value.
+ */
+ function lazyValue() {
+ var array = this.__wrapped__.value(),
+ dir = this.__dir__,
+ isArr = isArray(array),
+ isRight = dir < 0,
+ arrLength = isArr ? array.length : 0,
+ view = getView(0, arrLength, this.__views__),
+ start = view.start,
+ end = view.end,
+ length = end - start,
+ index = isRight ? end : (start - 1),
+ iteratees = this.__iteratees__,
+ iterLength = iteratees.length,
+ resIndex = 0,
+ takeCount = nativeMin(length, this.__takeCount__);
+
+ if (!isArr || arrLength < LARGE_ARRAY_SIZE || (arrLength == length && takeCount == length)) {
+ return baseWrapperValue((isRight && isArr) ? array.reverse() : array, this.__actions__);
+ }
+ var result = [];
+
+ outer:
+ while (length-- && resIndex < takeCount) {
+ index += dir;
+
+ var iterIndex = -1,
+ value = array[index];
+
+ while (++iterIndex < iterLength) {
+ var data = iteratees[iterIndex],
+ iteratee = data.iteratee,
+ type = data.type,
+ computed = iteratee(value);
+
+ if (type == LAZY_MAP_FLAG) {
+ value = computed;
+ } else if (!computed) {
+ if (type == LAZY_FILTER_FLAG) {
+ continue outer;
+ } else {
+ break outer;
+ }
+ }
+ }
+ result[resIndex++] = value;
+ }
+ return result;
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates a cache object to store key/value pairs.
+ *
+ * @private
+ * @static
+ * @name Cache
+ * @memberOf _.memoize
+ */
+ function MapCache() {
+ this.__data__ = {};
+ }
+
+ /**
+ * Removes `key` and its value from the cache.
+ *
+ * @private
+ * @name delete
+ * @memberOf _.memoize.Cache
+ * @param {string} key The key of the value to remove.
+ * @returns {boolean} Returns `true` if the entry was removed successfully, else `false`.
+ */
+ function mapDelete(key) {
+ return this.has(key) && delete this.__data__[key];
+ }
+
+ /**
+ * Gets the cached value for `key`.
+ *
+ * @private
+ * @name get
+ * @memberOf _.memoize.Cache
+ * @param {string} key The key of the value to get.
+ * @returns {*} Returns the cached value.
+ */
+ function mapGet(key) {
+ return key == '__proto__' ? undefined : this.__data__[key];
+ }
+
+ /**
+ * Checks if a cached value for `key` exists.
+ *
+ * @private
+ * @name has
+ * @memberOf _.memoize.Cache
+ * @param {string} key The key of the entry to check.
+ * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+ */
+ function mapHas(key) {
+ return key != '__proto__' && hasOwnProperty.call(this.__data__, key);
+ }
+
+ /**
+ * Sets `value` to `key` of the cache.
+ *
+ * @private
+ * @name set
+ * @memberOf _.memoize.Cache
+ * @param {string} key The key of the value to cache.
+ * @param {*} value The value to cache.
+ * @returns {Object} Returns the cache object.
+ */
+ function mapSet(key, value) {
+ if (key != '__proto__') {
+ this.__data__[key] = value;
+ }
+ return this;
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ *
+ * Creates a cache object to store unique values.
+ *
+ * @private
+ * @param {Array} [values] The values to cache.
+ */
+ function SetCache(values) {
+ var length = values ? values.length : 0;
+
+ this.data = { 'hash': nativeCreate(null), 'set': new Set };
+ while (length--) {
+ this.push(values[length]);
+ }
+ }
+
+ /**
+ * Checks if `value` is in `cache` mimicking the return signature of
+ * `_.indexOf` by returning `0` if the value is found, else `-1`.
+ *
+ * @private
+ * @param {Object} cache The cache to search.
+ * @param {*} value The value to search for.
+ * @returns {number} Returns `0` if `value` is found, else `-1`.
+ */
+ function cacheIndexOf(cache, value) {
+ var data = cache.data,
+ result = (typeof value == 'string' || isObject(value)) ? data.set.has(value) : data.hash[value];
+
+ return result ? 0 : -1;
+ }
+
+ /**
+ * Adds `value` to the cache.
+ *
+ * @private
+ * @name push
+ * @memberOf SetCache
+ * @param {*} value The value to cache.
+ */
+ function cachePush(value) {
+ var data = this.data;
+ if (typeof value == 'string' || isObject(value)) {
+ data.set.add(value);
+ } else {
+ data.hash[value] = true;
+ }
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates a new array joining `array` with `other`.
+ *
+ * @private
+ * @param {Array} array The array to join.
+ * @param {Array} other The other array to join.
+ * @returns {Array} Returns the new concatenated array.
+ */
+ function arrayConcat(array, other) {
+ var index = -1,
+ length = array.length,
+ othIndex = -1,
+ othLength = other.length,
+ result = Array(length + othLength);
+
+ while (++index < length) {
+ result[index] = array[index];
+ }
+ while (++othIndex < othLength) {
+ result[index++] = other[othIndex];
+ }
+ return result;
+ }
+
+ /**
+ * Copies the values of `source` to `array`.
+ *
+ * @private
+ * @param {Array} source The array to copy values from.
+ * @param {Array} [array=[]] The array to copy values to.
+ * @returns {Array} Returns `array`.
+ */
+ function arrayCopy(source, array) {
+ var index = -1,
+ length = source.length;
+
+ array || (array = Array(length));
+ while (++index < length) {
+ array[index] = source[index];
+ }
+ return array;
+ }
+
+ /**
+ * A specialized version of `_.forEach` for arrays without support for callback
+ * shorthands and `this` binding.
+ *
+ * @private
+ * @param {Array} array The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array} Returns `array`.
+ */
+ function arrayEach(array, iteratee) {
+ var index = -1,
+ length = array.length;
+
+ while (++index < length) {
+ if (iteratee(array[index], index, array) === false) {
+ break;
+ }
+ }
+ return array;
+ }
+
+ /**
+ * A specialized version of `_.forEachRight` for arrays without support for
+ * callback shorthands and `this` binding.
+ *
+ * @private
+ * @param {Array} array The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array} Returns `array`.
+ */
+ function arrayEachRight(array, iteratee) {
+ var length = array.length;
+
+ while (length--) {
+ if (iteratee(array[length], length, array) === false) {
+ break;
+ }
+ }
+ return array;
+ }
+
+ /**
+ * A specialized version of `_.every` for arrays without support for callback
+ * shorthands and `this` binding.
+ *
+ * @private
+ * @param {Array} array The array to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {boolean} Returns `true` if all elements pass the predicate check,
+ * else `false`.
+ */
+ function arrayEvery(array, predicate) {
+ var index = -1,
+ length = array.length;
+
+ while (++index < length) {
+ if (!predicate(array[index], index, array)) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * A specialized version of `baseExtremum` for arrays which invokes `iteratee`
+ * with one argument: (value).
+ *
+ * @private
+ * @param {Array} array The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {Function} comparator The function used to compare values.
+ * @param {*} exValue The initial extremum value.
+ * @returns {*} Returns the extremum value.
+ */
+ function arrayExtremum(array, iteratee, comparator, exValue) {
+ var index = -1,
+ length = array.length,
+ computed = exValue,
+ result = computed;
+
+ while (++index < length) {
+ var value = array[index],
+ current = +iteratee(value);
+
+ if (comparator(current, computed)) {
+ computed = current;
+ result = value;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * A specialized version of `_.filter` for arrays without support for callback
+ * shorthands and `this` binding.
+ *
+ * @private
+ * @param {Array} array The array to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {Array} Returns the new filtered array.
+ */
+ function arrayFilter(array, predicate) {
+ var index = -1,
+ length = array.length,
+ resIndex = -1,
+ result = [];
+
+ while (++index < length) {
+ var value = array[index];
+ if (predicate(value, index, array)) {
+ result[++resIndex] = value;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * A specialized version of `_.map` for arrays without support for callback
+ * shorthands and `this` binding.
+ *
+ * @private
+ * @param {Array} array The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array} Returns the new mapped array.
+ */
+ function arrayMap(array, iteratee) {
+ var index = -1,
+ length = array.length,
+ result = Array(length);
+
+ while (++index < length) {
+ result[index] = iteratee(array[index], index, array);
+ }
+ return result;
+ }
+
+ /**
+ * Appends the elements of `values` to `array`.
+ *
+ * @private
+ * @param {Array} array The array to modify.
+ * @param {Array} values The values to append.
+ * @returns {Array} Returns `array`.
+ */
+ function arrayPush(array, values) {
+ var index = -1,
+ length = values.length,
+ offset = array.length;
+
+ while (++index < length) {
+ array[offset + index] = values[index];
+ }
+ return array;
+ }
+
+ /**
+ * A specialized version of `_.reduce` for arrays without support for callback
+ * shorthands and `this` binding.
+ *
+ * @private
+ * @param {Array} array The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {*} [accumulator] The initial value.
+ * @param {boolean} [initFromArray] Specify using the first element of `array`
+ * as the initial value.
+ * @returns {*} Returns the accumulated value.
+ */
+ function arrayReduce(array, iteratee, accumulator, initFromArray) {
+ var index = -1,
+ length = array.length;
+
+ if (initFromArray && length) {
+ accumulator = array[++index];
+ }
+ while (++index < length) {
+ accumulator = iteratee(accumulator, array[index], index, array);
+ }
+ return accumulator;
+ }
+
+ /**
+ * A specialized version of `_.reduceRight` for arrays without support for
+ * callback shorthands and `this` binding.
+ *
+ * @private
+ * @param {Array} array The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {*} [accumulator] The initial value.
+ * @param {boolean} [initFromArray] Specify using the last element of `array`
+ * as the initial value.
+ * @returns {*} Returns the accumulated value.
+ */
+ function arrayReduceRight(array, iteratee, accumulator, initFromArray) {
+ var length = array.length;
+ if (initFromArray && length) {
+ accumulator = array[--length];
+ }
+ while (length--) {
+ accumulator = iteratee(accumulator, array[length], length, array);
+ }
+ return accumulator;
+ }
+
+ /**
+ * A specialized version of `_.some` for arrays without support for callback
+ * shorthands and `this` binding.
+ *
+ * @private
+ * @param {Array} array The array to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {boolean} Returns `true` if any element passes the predicate check,
+ * else `false`.
+ */
+ function arraySome(array, predicate) {
+ var index = -1,
+ length = array.length;
+
+ while (++index < length) {
+ if (predicate(array[index], index, array)) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /**
+ * A specialized version of `_.sum` for arrays without support for callback
+ * shorthands and `this` binding..
+ *
+ * @private
+ * @param {Array} array The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {number} Returns the sum.
+ */
+ function arraySum(array, iteratee) {
+ var length = array.length,
+ result = 0;
+
+ while (length--) {
+ result += +iteratee(array[length]) || 0;
+ }
+ return result;
+ }
+
+ /**
+ * Used by `_.defaults` to customize its `_.assign` use.
+ *
+ * @private
+ * @param {*} objectValue The destination object property value.
+ * @param {*} sourceValue The source object property value.
+ * @returns {*} Returns the value to assign to the destination object.
+ */
+ function assignDefaults(objectValue, sourceValue) {
+ return objectValue === undefined ? sourceValue : objectValue;
+ }
+
+ /**
+ * Used by `_.template` to customize its `_.assign` use.
+ *
+ * **Note:** This function is like `assignDefaults` except that it ignores
+ * inherited property values when checking if a property is `undefined`.
+ *
+ * @private
+ * @param {*} objectValue The destination object property value.
+ * @param {*} sourceValue The source object property value.
+ * @param {string} key The key associated with the object and source values.
+ * @param {Object} object The destination object.
+ * @returns {*} Returns the value to assign to the destination object.
+ */
+ function assignOwnDefaults(objectValue, sourceValue, key, object) {
+ return (objectValue === undefined || !hasOwnProperty.call(object, key))
+ ? sourceValue
+ : objectValue;
+ }
+
+ /**
+ * A specialized version of `_.assign` for customizing assigned values without
+ * support for argument juggling, multiple sources, and `this` binding `customizer`
+ * functions.
+ *
+ * @private
+ * @param {Object} object The destination object.
+ * @param {Object} source The source object.
+ * @param {Function} customizer The function to customize assigned values.
+ * @returns {Object} Returns `object`.
+ */
+ function assignWith(object, source, customizer) {
+ var index = -1,
+ props = keys(source),
+ length = props.length;
+
+ while (++index < length) {
+ var key = props[index],
+ value = object[key],
+ result = customizer(value, source[key], key, object, source);
+
+ if ((result === result ? (result !== value) : (value === value)) ||
+ (value === undefined && !(key in object))) {
+ object[key] = result;
+ }
+ }
+ return object;
+ }
+
+ /**
+ * The base implementation of `_.assign` without support for argument juggling,
+ * multiple sources, and `customizer` functions.
+ *
+ * @private
+ * @param {Object} object The destination object.
+ * @param {Object} source The source object.
+ * @returns {Object} Returns `object`.
+ */
+ function baseAssign(object, source) {
+ return source == null
+ ? object
+ : baseCopy(source, keys(source), object);
+ }
+
+ /**
+ * The base implementation of `_.at` without support for string collections
+ * and individual key arguments.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {number[]|string[]} props The property names or indexes of elements to pick.
+ * @returns {Array} Returns the new array of picked elements.
+ */
+ function baseAt(collection, props) {
+ var index = -1,
+ isNil = collection == null,
+ isArr = !isNil && isArrayLike(collection),
+ length = isArr ? collection.length : 0,
+ propsLength = props.length,
+ result = Array(propsLength);
+
+ while(++index < propsLength) {
+ var key = props[index];
+ if (isArr) {
+ result[index] = isIndex(key, length) ? collection[key] : undefined;
+ } else {
+ result[index] = isNil ? undefined : collection[key];
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Copies properties of `source` to `object`.
+ *
+ * @private
+ * @param {Object} source The object to copy properties from.
+ * @param {Array} props The property names to copy.
+ * @param {Object} [object={}] The object to copy properties to.
+ * @returns {Object} Returns `object`.
+ */
+ function baseCopy(source, props, object) {
+ object || (object = {});
+
+ var index = -1,
+ length = props.length;
+
+ while (++index < length) {
+ var key = props[index];
+ object[key] = source[key];
+ }
+ return object;
+ }
+
+ /**
+ * The base implementation of `_.callback` which supports specifying the
+ * number of arguments to provide to `func`.
+ *
+ * @private
+ * @param {*} [func=_.identity] The value to convert to a callback.
+ * @param {*} [thisArg] The `this` binding of `func`.
+ * @param {number} [argCount] The number of arguments to provide to `func`.
+ * @returns {Function} Returns the callback.
+ */
+ function baseCallback(func, thisArg, argCount) {
+ var type = typeof func;
+ if (type == 'function') {
+ return thisArg === undefined
+ ? func
+ : bindCallback(func, thisArg, argCount);
+ }
+ if (func == null) {
+ return identity;
+ }
+ if (type == 'object') {
+ return baseMatches(func);
+ }
+ return thisArg === undefined
+ ? property(func)
+ : baseMatchesProperty(func, thisArg);
+ }
+
+ /**
+ * The base implementation of `_.clone` without support for argument juggling
+ * and `this` binding `customizer` functions.
+ *
+ * @private
+ * @param {*} value The value to clone.
+ * @param {boolean} [isDeep] Specify a deep clone.
+ * @param {Function} [customizer] The function to customize cloning values.
+ * @param {string} [key] The key of `value`.
+ * @param {Object} [object] The object `value` belongs to.
+ * @param {Array} [stackA=[]] Tracks traversed source objects.
+ * @param {Array} [stackB=[]] Associates clones with source counterparts.
+ * @returns {*} Returns the cloned value.
+ */
+ function baseClone(value, isDeep, customizer, key, object, stackA, stackB) {
+ var result;
+ if (customizer) {
+ result = object ? customizer(value, key, object) : customizer(value);
+ }
+ if (result !== undefined) {
+ return result;
+ }
+ if (!isObject(value)) {
+ return value;
+ }
+ var isArr = isArray(value);
+ if (isArr) {
+ result = initCloneArray(value);
+ if (!isDeep) {
+ return arrayCopy(value, result);
+ }
+ } else {
+ var tag = objToString.call(value),
+ isFunc = tag == funcTag;
+
+ if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
+ result = initCloneObject(isFunc ? {} : value);
+ if (!isDeep) {
+ return baseAssign(result, value);
+ }
+ } else {
+ return cloneableTags[tag]
+ ? initCloneByTag(value, tag, isDeep)
+ : (object ? value : {});
+ }
+ }
+ // Check for circular references and return its corresponding clone.
+ stackA || (stackA = []);
+ stackB || (stackB = []);
+
+ var length = stackA.length;
+ while (length--) {
+ if (stackA[length] == value) {
+ return stackB[length];
+ }
+ }
+ // Add the source value to the stack of traversed objects and associate it with its clone.
+ stackA.push(value);
+ stackB.push(result);
+
+ // Recursively populate clone (susceptible to call stack limits).
+ (isArr ? arrayEach : baseForOwn)(value, function(subValue, key) {
+ result[key] = baseClone(subValue, isDeep, customizer, key, value, stackA, stackB);
+ });
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.create` without support for assigning
+ * properties to the created object.
+ *
+ * @private
+ * @param {Object} prototype The object to inherit from.
+ * @returns {Object} Returns the new object.
+ */
+ var baseCreate = (function() {
+ function object() {}
+ return function(prototype) {
+ if (isObject(prototype)) {
+ object.prototype = prototype;
+ var result = new object;
+ object.prototype = undefined;
+ }
+ return result || {};
+ };
+ }());
+
+ /**
+ * The base implementation of `_.delay` and `_.defer` which accepts an index
+ * of where to slice the arguments to provide to `func`.
+ *
+ * @private
+ * @param {Function} func The function to delay.
+ * @param {number} wait The number of milliseconds to delay invocation.
+ * @param {Object} args The arguments provide to `func`.
+ * @returns {number} Returns the timer id.
+ */
+ function baseDelay(func, wait, args) {
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ return setTimeout(function() { func.apply(undefined, args); }, wait);
+ }
+
+ /**
+ * The base implementation of `_.difference` which accepts a single array
+ * of values to exclude.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {Array} values The values to exclude.
+ * @returns {Array} Returns the new array of filtered values.
+ */
+ function baseDifference(array, values) {
+ var length = array ? array.length : 0,
+ result = [];
+
+ if (!length) {
+ return result;
+ }
+ var index = -1,
+ indexOf = getIndexOf(),
+ isCommon = indexOf == baseIndexOf,
+ cache = (isCommon && values.length >= LARGE_ARRAY_SIZE) ? createCache(values) : null,
+ valuesLength = values.length;
+
+ if (cache) {
+ indexOf = cacheIndexOf;
+ isCommon = false;
+ values = cache;
+ }
+ outer:
+ while (++index < length) {
+ var value = array[index];
+
+ if (isCommon && value === value) {
+ var valuesIndex = valuesLength;
+ while (valuesIndex--) {
+ if (values[valuesIndex] === value) {
+ continue outer;
+ }
+ }
+ result.push(value);
+ }
+ else if (indexOf(values, value, 0) < 0) {
+ result.push(value);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.forEach` without support for callback
+ * shorthands and `this` binding.
+ *
+ * @private
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array|Object|string} Returns `collection`.
+ */
+ var baseEach = createBaseEach(baseForOwn);
+
+ /**
+ * The base implementation of `_.forEachRight` without support for callback
+ * shorthands and `this` binding.
+ *
+ * @private
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array|Object|string} Returns `collection`.
+ */
+ var baseEachRight = createBaseEach(baseForOwnRight, true);
+
+ /**
+ * The base implementation of `_.every` without support for callback
+ * shorthands and `this` binding.
+ *
+ * @private
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {boolean} Returns `true` if all elements pass the predicate check,
+ * else `false`
+ */
+ function baseEvery(collection, predicate) {
+ var result = true;
+ baseEach(collection, function(value, index, collection) {
+ result = !!predicate(value, index, collection);
+ return result;
+ });
+ return result;
+ }
+
+ /**
+ * Gets the extremum value of `collection` invoking `iteratee` for each value
+ * in `collection` to generate the criterion by which the value is ranked.
+ * The `iteratee` is invoked with three arguments: (value, index|key, collection).
+ *
+ * @private
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {Function} comparator The function used to compare values.
+ * @param {*} exValue The initial extremum value.
+ * @returns {*} Returns the extremum value.
+ */
+ function baseExtremum(collection, iteratee, comparator, exValue) {
+ var computed = exValue,
+ result = computed;
+
+ baseEach(collection, function(value, index, collection) {
+ var current = +iteratee(value, index, collection);
+ if (comparator(current, computed) || (current === exValue && current === result)) {
+ computed = current;
+ result = value;
+ }
+ });
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.fill` without an iteratee call guard.
+ *
+ * @private
+ * @param {Array} array The array to fill.
+ * @param {*} value The value to fill `array` with.
+ * @param {number} [start=0] The start position.
+ * @param {number} [end=array.length] The end position.
+ * @returns {Array} Returns `array`.
+ */
+ function baseFill(array, value, start, end) {
+ var length = array.length;
+
+ start = start == null ? 0 : (+start || 0);
+ if (start < 0) {
+ start = -start > length ? 0 : (length + start);
+ }
+ end = (end === undefined || end > length) ? length : (+end || 0);
+ if (end < 0) {
+ end += length;
+ }
+ length = start > end ? 0 : (end >>> 0);
+ start >>>= 0;
+
+ while (start < length) {
+ array[start++] = value;
+ }
+ return array;
+ }
+
+ /**
+ * The base implementation of `_.filter` without support for callback
+ * shorthands and `this` binding.
+ *
+ * @private
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {Array} Returns the new filtered array.
+ */
+ function baseFilter(collection, predicate) {
+ var result = [];
+ baseEach(collection, function(value, index, collection) {
+ if (predicate(value, index, collection)) {
+ result.push(value);
+ }
+ });
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.find`, `_.findLast`, `_.findKey`, and `_.findLastKey`,
+ * without support for callback shorthands and `this` binding, which iterates
+ * over `collection` using the provided `eachFunc`.
+ *
+ * @private
+ * @param {Array|Object|string} collection The collection to search.
+ * @param {Function} predicate The function invoked per iteration.
+ * @param {Function} eachFunc The function to iterate over `collection`.
+ * @param {boolean} [retKey] Specify returning the key of the found element
+ * instead of the element itself.
+ * @returns {*} Returns the found element or its key, else `undefined`.
+ */
+ function baseFind(collection, predicate, eachFunc, retKey) {
+ var result;
+ eachFunc(collection, function(value, key, collection) {
+ if (predicate(value, key, collection)) {
+ result = retKey ? key : value;
+ return false;
+ }
+ });
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.flatten` with added support for restricting
+ * flattening and specifying the start index.
+ *
+ * @private
+ * @param {Array} array The array to flatten.
+ * @param {boolean} [isDeep] Specify a deep flatten.
+ * @param {boolean} [isStrict] Restrict flattening to arrays-like objects.
+ * @param {Array} [result=[]] The initial result value.
+ * @returns {Array} Returns the new flattened array.
+ */
+ function baseFlatten(array, isDeep, isStrict, result) {
+ result || (result = []);
+
+ var index = -1,
+ length = array.length;
+
+ while (++index < length) {
+ var value = array[index];
+ if (isObjectLike(value) && isArrayLike(value) &&
+ (isStrict || isArray(value) || isArguments(value))) {
+ if (isDeep) {
+ // Recursively flatten arrays (susceptible to call stack limits).
+ baseFlatten(value, isDeep, isStrict, result);
+ } else {
+ arrayPush(result, value);
+ }
+ } else if (!isStrict) {
+ result[result.length] = value;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `baseForIn` and `baseForOwn` which iterates
+ * over `object` properties returned by `keysFunc` invoking `iteratee` for
+ * each property. Iteratee functions may exit iteration early by explicitly
+ * returning `false`.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {Function} keysFunc The function to get the keys of `object`.
+ * @returns {Object} Returns `object`.
+ */
+ var baseFor = createBaseFor();
+
+ /**
+ * This function is like `baseFor` except that it iterates over properties
+ * in the opposite order.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {Function} keysFunc The function to get the keys of `object`.
+ * @returns {Object} Returns `object`.
+ */
+ var baseForRight = createBaseFor(true);
+
+ /**
+ * The base implementation of `_.forIn` without support for callback
+ * shorthands and `this` binding.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Object} Returns `object`.
+ */
+ function baseForIn(object, iteratee) {
+ return baseFor(object, iteratee, keysIn);
+ }
+
+ /**
+ * The base implementation of `_.forOwn` without support for callback
+ * shorthands and `this` binding.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Object} Returns `object`.
+ */
+ function baseForOwn(object, iteratee) {
+ return baseFor(object, iteratee, keys);
+ }
+
+ /**
+ * The base implementation of `_.forOwnRight` without support for callback
+ * shorthands and `this` binding.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Object} Returns `object`.
+ */
+ function baseForOwnRight(object, iteratee) {
+ return baseForRight(object, iteratee, keys);
+ }
+
+ /**
+ * The base implementation of `_.functions` which creates an array of
+ * `object` function property names filtered from those provided.
+ *
+ * @private
+ * @param {Object} object The object to inspect.
+ * @param {Array} props The property names to filter.
+ * @returns {Array} Returns the new array of filtered property names.
+ */
+ function baseFunctions(object, props) {
+ var index = -1,
+ length = props.length,
+ resIndex = -1,
+ result = [];
+
+ while (++index < length) {
+ var key = props[index];
+ if (isFunction(object[key])) {
+ result[++resIndex] = key;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `get` without support for string paths
+ * and default values.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array} path The path of the property to get.
+ * @param {string} [pathKey] The key representation of path.
+ * @returns {*} Returns the resolved value.
+ */
+ function baseGet(object, path, pathKey) {
+ if (object == null) {
+ return;
+ }
+ if (pathKey !== undefined && pathKey in toObject(object)) {
+ path = [pathKey];
+ }
+ var index = 0,
+ length = path.length;
+
+ while (object != null && index < length) {
+ object = object[path[index++]];
+ }
+ return (index && index == length) ? object : undefined;
+ }
+
+ /**
+ * The base implementation of `_.isEqual` without support for `this` binding
+ * `customizer` functions.
+ *
+ * @private
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @param {Function} [customizer] The function to customize comparing values.
+ * @param {boolean} [isLoose] Specify performing partial comparisons.
+ * @param {Array} [stackA] Tracks traversed `value` objects.
+ * @param {Array} [stackB] Tracks traversed `other` objects.
+ * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
+ */
+ function baseIsEqual(value, other, customizer, isLoose, stackA, stackB) {
+ if (value === other) {
+ return true;
+ }
+ if (value == null || other == null || (!isObject(value) && !isObjectLike(other))) {
+ return value !== value && other !== other;
+ }
+ return baseIsEqualDeep(value, other, baseIsEqual, customizer, isLoose, stackA, stackB);
+ }
+
+ /**
+ * A specialized version of `baseIsEqual` for arrays and objects which performs
+ * deep comparisons and tracks traversed objects enabling objects with circular
+ * references to be compared.
+ *
+ * @private
+ * @param {Object} object The object to compare.
+ * @param {Object} other The other object to compare.
+ * @param {Function} equalFunc The function to determine equivalents of values.
+ * @param {Function} [customizer] The function to customize comparing objects.
+ * @param {boolean} [isLoose] Specify performing partial comparisons.
+ * @param {Array} [stackA=[]] Tracks traversed `value` objects.
+ * @param {Array} [stackB=[]] Tracks traversed `other` objects.
+ * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
+ */
+ function baseIsEqualDeep(object, other, equalFunc, customizer, isLoose, stackA, stackB) {
+ var objIsArr = isArray(object),
+ othIsArr = isArray(other),
+ objTag = arrayTag,
+ othTag = arrayTag;
+
+ if (!objIsArr) {
+ objTag = objToString.call(object);
+ if (objTag == argsTag) {
+ objTag = objectTag;
+ } else if (objTag != objectTag) {
+ objIsArr = isTypedArray(object);
+ }
+ }
+ if (!othIsArr) {
+ othTag = objToString.call(other);
+ if (othTag == argsTag) {
+ othTag = objectTag;
+ } else if (othTag != objectTag) {
+ othIsArr = isTypedArray(other);
+ }
+ }
+ var objIsObj = objTag == objectTag,
+ othIsObj = othTag == objectTag,
+ isSameTag = objTag == othTag;
+
+ if (isSameTag && !(objIsArr || objIsObj)) {
+ return equalByTag(object, other, objTag);
+ }
+ if (!isLoose) {
+ var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),
+ othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');
+
+ if (objIsWrapped || othIsWrapped) {
+ return equalFunc(objIsWrapped ? object.value() : object, othIsWrapped ? other.value() : other, customizer, isLoose, stackA, stackB);
+ }
+ }
+ if (!isSameTag) {
+ return false;
+ }
+ // Assume cyclic values are equal.
+ // For more information on detecting circular references see https://es5.github.io/#JO.
+ stackA || (stackA = []);
+ stackB || (stackB = []);
+
+ var length = stackA.length;
+ while (length--) {
+ if (stackA[length] == object) {
+ return stackB[length] == other;
+ }
+ }
+ // Add `object` and `other` to the stack of traversed objects.
+ stackA.push(object);
+ stackB.push(other);
+
+ var result = (objIsArr ? equalArrays : equalObjects)(object, other, equalFunc, customizer, isLoose, stackA, stackB);
+
+ stackA.pop();
+ stackB.pop();
+
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.isMatch` without support for callback
+ * shorthands and `this` binding.
+ *
+ * @private
+ * @param {Object} object The object to inspect.
+ * @param {Array} matchData The propery names, values, and compare flags to match.
+ * @param {Function} [customizer] The function to customize comparing objects.
+ * @returns {boolean} Returns `true` if `object` is a match, else `false`.
+ */
+ function baseIsMatch(object, matchData, customizer) {
+ var index = matchData.length,
+ length = index,
+ noCustomizer = !customizer;
+
+ if (object == null) {
+ return !length;
+ }
+ object = toObject(object);
+ while (index--) {
+ var data = matchData[index];
+ if ((noCustomizer && data[2])
+ ? data[1] !== object[data[0]]
+ : !(data[0] in object)
+ ) {
+ return false;
+ }
+ }
+ while (++index < length) {
+ data = matchData[index];
+ var key = data[0],
+ objValue = object[key],
+ srcValue = data[1];
+
+ if (noCustomizer && data[2]) {
+ if (objValue === undefined && !(key in object)) {
+ return false;
+ }
+ } else {
+ var result = customizer ? customizer(objValue, srcValue, key) : undefined;
+ if (!(result === undefined ? baseIsEqual(srcValue, objValue, customizer, true) : result)) {
+ return false;
+ }
+ }
+ }
+ return true;
+ }
+
+ /**
+ * The base implementation of `_.map` without support for callback shorthands
+ * and `this` binding.
+ *
+ * @private
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array} Returns the new mapped array.
+ */
+ function baseMap(collection, iteratee) {
+ var index = -1,
+ result = isArrayLike(collection) ? Array(collection.length) : [];
+
+ baseEach(collection, function(value, key, collection) {
+ result[++index] = iteratee(value, key, collection);
+ });
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.matches` which does not clone `source`.
+ *
+ * @private
+ * @param {Object} source The object of property values to match.
+ * @returns {Function} Returns the new function.
+ */
+ function baseMatches(source) {
+ var matchData = getMatchData(source);
+ if (matchData.length == 1 && matchData[0][2]) {
+ var key = matchData[0][0],
+ value = matchData[0][1];
+
+ return function(object) {
+ if (object == null) {
+ return false;
+ }
+ return object[key] === value && (value !== undefined || (key in toObject(object)));
+ };
+ }
+ return function(object) {
+ return baseIsMatch(object, matchData);
+ };
+ }
+
+ /**
+ * The base implementation of `_.matchesProperty` which does not clone `srcValue`.
+ *
+ * @private
+ * @param {string} path The path of the property to get.
+ * @param {*} srcValue The value to compare.
+ * @returns {Function} Returns the new function.
+ */
+ function baseMatchesProperty(path, srcValue) {
+ var isArr = isArray(path),
+ isCommon = isKey(path) && isStrictComparable(srcValue),
+ pathKey = (path + '');
+
+ path = toPath(path);
+ return function(object) {
+ if (object == null) {
+ return false;
+ }
+ var key = pathKey;
+ object = toObject(object);
+ if ((isArr || !isCommon) && !(key in object)) {
+ object = path.length == 1 ? object : baseGet(object, baseSlice(path, 0, -1));
+ if (object == null) {
+ return false;
+ }
+ key = last(path);
+ object = toObject(object);
+ }
+ return object[key] === srcValue
+ ? (srcValue !== undefined || (key in object))
+ : baseIsEqual(srcValue, object[key], undefined, true);
+ };
+ }
+
+ /**
+ * The base implementation of `_.merge` without support for argument juggling,
+ * multiple sources, and `this` binding `customizer` functions.
+ *
+ * @private
+ * @param {Object} object The destination object.
+ * @param {Object} source The source object.
+ * @param {Function} [customizer] The function to customize merged values.
+ * @param {Array} [stackA=[]] Tracks traversed source objects.
+ * @param {Array} [stackB=[]] Associates values with source counterparts.
+ * @returns {Object} Returns `object`.
+ */
+ function baseMerge(object, source, customizer, stackA, stackB) {
+ if (!isObject(object)) {
+ return object;
+ }
+ var isSrcArr = isArrayLike(source) && (isArray(source) || isTypedArray(source)),
+ props = isSrcArr ? undefined : keys(source);
+
+ arrayEach(props || source, function(srcValue, key) {
+ if (props) {
+ key = srcValue;
+ srcValue = source[key];
+ }
+ if (isObjectLike(srcValue)) {
+ stackA || (stackA = []);
+ stackB || (stackB = []);
+ baseMergeDeep(object, source, key, baseMerge, customizer, stackA, stackB);
+ }
+ else {
+ var value = object[key],
+ result = customizer ? customizer(value, srcValue, key, object, source) : undefined,
+ isCommon = result === undefined;
+
+ if (isCommon) {
+ result = srcValue;
+ }
+ if ((result !== undefined || (isSrcArr && !(key in object))) &&
+ (isCommon || (result === result ? (result !== value) : (value === value)))) {
+ object[key] = result;
+ }
+ }
+ });
+ return object;
+ }
+
+ /**
+ * A specialized version of `baseMerge` for arrays and objects which performs
+ * deep merges and tracks traversed objects enabling objects with circular
+ * references to be merged.
+ *
+ * @private
+ * @param {Object} object The destination object.
+ * @param {Object} source The source object.
+ * @param {string} key The key of the value to merge.
+ * @param {Function} mergeFunc The function to merge values.
+ * @param {Function} [customizer] The function to customize merged values.
+ * @param {Array} [stackA=[]] Tracks traversed source objects.
+ * @param {Array} [stackB=[]] Associates values with source counterparts.
+ * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
+ */
+ function baseMergeDeep(object, source, key, mergeFunc, customizer, stackA, stackB) {
+ var length = stackA.length,
+ srcValue = source[key];
+
+ while (length--) {
+ if (stackA[length] == srcValue) {
+ object[key] = stackB[length];
+ return;
+ }
+ }
+ var value = object[key],
+ result = customizer ? customizer(value, srcValue, key, object, source) : undefined,
+ isCommon = result === undefined;
+
+ if (isCommon) {
+ result = srcValue;
+ if (isArrayLike(srcValue) && (isArray(srcValue) || isTypedArray(srcValue))) {
+ result = isArray(value)
+ ? value
+ : (isArrayLike(value) ? arrayCopy(value) : []);
+ }
+ else if (isPlainObject(srcValue) || isArguments(srcValue)) {
+ result = isArguments(value)
+ ? toPlainObject(value)
+ : (isPlainObject(value) ? value : {});
+ }
+ else {
+ isCommon = false;
+ }
+ }
+ // Add the source value to the stack of traversed objects and associate
+ // it with its merged value.
+ stackA.push(srcValue);
+ stackB.push(result);
+
+ if (isCommon) {
+ // Recursively merge objects and arrays (susceptible to call stack limits).
+ object[key] = mergeFunc(result, srcValue, customizer, stackA, stackB);
+ } else if (result === result ? (result !== value) : (value === value)) {
+ object[key] = result;
+ }
+ }
+
+ /**
+ * The base implementation of `_.property` without support for deep paths.
+ *
+ * @private
+ * @param {string} key The key of the property to get.
+ * @returns {Function} Returns the new function.
+ */
+ function baseProperty(key) {
+ return function(object) {
+ return object == null ? undefined : object[key];
+ };
+ }
+
+ /**
+ * A specialized version of `baseProperty` which supports deep paths.
+ *
+ * @private
+ * @param {Array|string} path The path of the property to get.
+ * @returns {Function} Returns the new function.
+ */
+ function basePropertyDeep(path) {
+ var pathKey = (path + '');
+ path = toPath(path);
+ return function(object) {
+ return baseGet(object, path, pathKey);
+ };
+ }
+
+ /**
+ * The base implementation of `_.pullAt` without support for individual
+ * index arguments and capturing the removed elements.
+ *
+ * @private
+ * @param {Array} array The array to modify.
+ * @param {number[]} indexes The indexes of elements to remove.
+ * @returns {Array} Returns `array`.
+ */
+ function basePullAt(array, indexes) {
+ var length = array ? indexes.length : 0;
+ while (length--) {
+ var index = indexes[length];
+ if (index != previous && isIndex(index)) {
+ var previous = index;
+ splice.call(array, index, 1);
+ }
+ }
+ return array;
+ }
+
+ /**
+ * The base implementation of `_.random` without support for argument juggling
+ * and returning floating-point numbers.
+ *
+ * @private
+ * @param {number} min The minimum possible value.
+ * @param {number} max The maximum possible value.
+ * @returns {number} Returns the random number.
+ */
+ function baseRandom(min, max) {
+ return min + nativeFloor(nativeRandom() * (max - min + 1));
+ }
+
+ /**
+ * The base implementation of `_.reduce` and `_.reduceRight` without support
+ * for callback shorthands and `this` binding, which iterates over `collection`
+ * using the provided `eachFunc`.
+ *
+ * @private
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {*} accumulator The initial value.
+ * @param {boolean} initFromCollection Specify using the first or last element
+ * of `collection` as the initial value.
+ * @param {Function} eachFunc The function to iterate over `collection`.
+ * @returns {*} Returns the accumulated value.
+ */
+ function baseReduce(collection, iteratee, accumulator, initFromCollection, eachFunc) {
+ eachFunc(collection, function(value, index, collection) {
+ accumulator = initFromCollection
+ ? (initFromCollection = false, value)
+ : iteratee(accumulator, value, index, collection);
+ });
+ return accumulator;
+ }
+
+ /**
+ * The base implementation of `setData` without support for hot loop detection.
+ *
+ * @private
+ * @param {Function} func The function to associate metadata with.
+ * @param {*} data The metadata.
+ * @returns {Function} Returns `func`.
+ */
+ var baseSetData = !metaMap ? identity : function(func, data) {
+ metaMap.set(func, data);
+ return func;
+ };
+
+ /**
+ * The base implementation of `_.slice` without an iteratee call guard.
+ *
+ * @private
+ * @param {Array} array The array to slice.
+ * @param {number} [start=0] The start position.
+ * @param {number} [end=array.length] The end position.
+ * @returns {Array} Returns the slice of `array`.
+ */
+ function baseSlice(array, start, end) {
+ var index = -1,
+ length = array.length;
+
+ start = start == null ? 0 : (+start || 0);
+ if (start < 0) {
+ start = -start > length ? 0 : (length + start);
+ }
+ end = (end === undefined || end > length) ? length : (+end || 0);
+ if (end < 0) {
+ end += length;
+ }
+ length = start > end ? 0 : ((end - start) >>> 0);
+ start >>>= 0;
+
+ var result = Array(length);
+ while (++index < length) {
+ result[index] = array[index + start];
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.some` without support for callback shorthands
+ * and `this` binding.
+ *
+ * @private
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {boolean} Returns `true` if any element passes the predicate check,
+ * else `false`.
+ */
+ function baseSome(collection, predicate) {
+ var result;
+
+ baseEach(collection, function(value, index, collection) {
+ result = predicate(value, index, collection);
+ return !result;
+ });
+ return !!result;
+ }
+
+ /**
+ * The base implementation of `_.sortBy` which uses `comparer` to define
+ * the sort order of `array` and replaces criteria objects with their
+ * corresponding values.
+ *
+ * @private
+ * @param {Array} array The array to sort.
+ * @param {Function} comparer The function to define sort order.
+ * @returns {Array} Returns `array`.
+ */
+ function baseSortBy(array, comparer) {
+ var length = array.length;
+
+ array.sort(comparer);
+ while (length--) {
+ array[length] = array[length].value;
+ }
+ return array;
+ }
+
+ /**
+ * The base implementation of `_.sortByOrder` without param guards.
+ *
+ * @private
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by.
+ * @param {boolean[]} orders The sort orders of `iteratees`.
+ * @returns {Array} Returns the new sorted array.
+ */
+ function baseSortByOrder(collection, iteratees, orders) {
+ var callback = getCallback(),
+ index = -1;
+
+ iteratees = arrayMap(iteratees, function(iteratee) { return callback(iteratee); });
+
+ var result = baseMap(collection, function(value) {
+ var criteria = arrayMap(iteratees, function(iteratee) { return iteratee(value); });
+ return { 'criteria': criteria, 'index': ++index, 'value': value };
+ });
+
+ return baseSortBy(result, function(object, other) {
+ return compareMultiple(object, other, orders);
+ });
+ }
+
+ /**
+ * The base implementation of `_.sum` without support for callback shorthands
+ * and `this` binding.
+ *
+ * @private
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {number} Returns the sum.
+ */
+ function baseSum(collection, iteratee) {
+ var result = 0;
+ baseEach(collection, function(value, index, collection) {
+ result += +iteratee(value, index, collection) || 0;
+ });
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.uniq` without support for callback shorthands
+ * and `this` binding.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {Function} [iteratee] The function invoked per iteration.
+ * @returns {Array} Returns the new duplicate-value-free array.
+ */
+ function baseUniq(array, iteratee) {
+ var index = -1,
+ indexOf = getIndexOf(),
+ length = array.length,
+ isCommon = indexOf == baseIndexOf,
+ isLarge = isCommon && length >= LARGE_ARRAY_SIZE,
+ seen = isLarge ? createCache() : null,
+ result = [];
+
+ if (seen) {
+ indexOf = cacheIndexOf;
+ isCommon = false;
+ } else {
+ isLarge = false;
+ seen = iteratee ? [] : result;
+ }
+ outer:
+ while (++index < length) {
+ var value = array[index],
+ computed = iteratee ? iteratee(value, index, array) : value;
+
+ if (isCommon && value === value) {
+ var seenIndex = seen.length;
+ while (seenIndex--) {
+ if (seen[seenIndex] === computed) {
+ continue outer;
+ }
+ }
+ if (iteratee) {
+ seen.push(computed);
+ }
+ result.push(value);
+ }
+ else if (indexOf(seen, computed, 0) < 0) {
+ if (iteratee || isLarge) {
+ seen.push(computed);
+ }
+ result.push(value);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.values` and `_.valuesIn` which creates an
+ * array of `object` property values corresponding to the property names
+ * of `props`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array} props The property names to get values for.
+ * @returns {Object} Returns the array of property values.
+ */
+ function baseValues(object, props) {
+ var index = -1,
+ length = props.length,
+ result = Array(length);
+
+ while (++index < length) {
+ result[index] = object[props[index]];
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of `_.dropRightWhile`, `_.dropWhile`, `_.takeRightWhile`,
+ * and `_.takeWhile` without support for callback shorthands and `this` binding.
+ *
+ * @private
+ * @param {Array} array The array to query.
+ * @param {Function} predicate The function invoked per iteration.
+ * @param {boolean} [isDrop] Specify dropping elements instead of taking them.
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Array} Returns the slice of `array`.
+ */
+ function baseWhile(array, predicate, isDrop, fromRight) {
+ var length = array.length,
+ index = fromRight ? length : -1;
+
+ while ((fromRight ? index-- : ++index < length) && predicate(array[index], index, array)) {}
+ return isDrop
+ ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
+ : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));
+ }
+
+ /**
+ * The base implementation of `wrapperValue` which returns the result of
+ * performing a sequence of actions on the unwrapped `value`, where each
+ * successive action is supplied the return value of the previous.
+ *
+ * @private
+ * @param {*} value The unwrapped value.
+ * @param {Array} actions Actions to peform to resolve the unwrapped value.
+ * @returns {*} Returns the resolved value.
+ */
+ function baseWrapperValue(value, actions) {
+ var result = value;
+ if (result instanceof LazyWrapper) {
+ result = result.value();
+ }
+ var index = -1,
+ length = actions.length;
+
+ while (++index < length) {
+ var action = actions[index];
+ result = action.func.apply(action.thisArg, arrayPush([result], action.args));
+ }
+ return result;
+ }
+
+ /**
+ * Performs a binary search of `array` to determine the index at which `value`
+ * should be inserted into `array` in order to maintain its sort order.
+ *
+ * @private
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @param {boolean} [retHighest] Specify returning the highest qualified index.
+ * @returns {number} Returns the index at which `value` should be inserted
+ * into `array`.
+ */
+ function binaryIndex(array, value, retHighest) {
+ var low = 0,
+ high = array ? array.length : low;
+
+ if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) {
+ while (low < high) {
+ var mid = (low + high) >>> 1,
+ computed = array[mid];
+
+ if ((retHighest ? (computed <= value) : (computed < value)) && computed !== null) {
+ low = mid + 1;
+ } else {
+ high = mid;
+ }
+ }
+ return high;
+ }
+ return binaryIndexBy(array, value, identity, retHighest);
+ }
+
+ /**
+ * This function is like `binaryIndex` except that it invokes `iteratee` for
+ * `value` and each element of `array` to compute their sort ranking. The
+ * iteratee is invoked with one argument; (value).
+ *
+ * @private
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {boolean} [retHighest] Specify returning the highest qualified index.
+ * @returns {number} Returns the index at which `value` should be inserted
+ * into `array`.
+ */
+ function binaryIndexBy(array, value, iteratee, retHighest) {
+ value = iteratee(value);
+
+ var low = 0,
+ high = array ? array.length : 0,
+ valIsNaN = value !== value,
+ valIsNull = value === null,
+ valIsUndef = value === undefined;
+
+ while (low < high) {
+ var mid = nativeFloor((low + high) / 2),
+ computed = iteratee(array[mid]),
+ isDef = computed !== undefined,
+ isReflexive = computed === computed;
+
+ if (valIsNaN) {
+ var setLow = isReflexive || retHighest;
+ } else if (valIsNull) {
+ setLow = isReflexive && isDef && (retHighest || computed != null);
+ } else if (valIsUndef) {
+ setLow = isReflexive && (retHighest || isDef);
+ } else if (computed == null) {
+ setLow = false;
+ } else {
+ setLow = retHighest ? (computed <= value) : (computed < value);
+ }
+ if (setLow) {
+ low = mid + 1;
+ } else {
+ high = mid;
+ }
+ }
+ return nativeMin(high, MAX_ARRAY_INDEX);
+ }
+
+ /**
+ * A specialized version of `baseCallback` which only supports `this` binding
+ * and specifying the number of arguments to provide to `func`.
+ *
+ * @private
+ * @param {Function} func The function to bind.
+ * @param {*} thisArg The `this` binding of `func`.
+ * @param {number} [argCount] The number of arguments to provide to `func`.
+ * @returns {Function} Returns the callback.
+ */
+ function bindCallback(func, thisArg, argCount) {
+ if (typeof func != 'function') {
+ return identity;
+ }
+ if (thisArg === undefined) {
+ return func;
+ }
+ switch (argCount) {
+ case 1: return function(value) {
+ return func.call(thisArg, value);
+ };
+ case 3: return function(value, index, collection) {
+ return func.call(thisArg, value, index, collection);
+ };
+ case 4: return function(accumulator, value, index, collection) {
+ return func.call(thisArg, accumulator, value, index, collection);
+ };
+ case 5: return function(value, other, key, object, source) {
+ return func.call(thisArg, value, other, key, object, source);
+ };
+ }
+ return function() {
+ return func.apply(thisArg, arguments);
+ };
+ }
+
+ /**
+ * Creates a clone of the given array buffer.
+ *
+ * @private
+ * @param {ArrayBuffer} buffer The array buffer to clone.
+ * @returns {ArrayBuffer} Returns the cloned array buffer.
+ */
+ function bufferClone(buffer) {
+ var result = new ArrayBuffer(buffer.byteLength),
+ view = new Uint8Array(result);
+
+ view.set(new Uint8Array(buffer));
+ return result;
+ }
+
+ /**
+ * Creates an array that is the composition of partially applied arguments,
+ * placeholders, and provided arguments into a single array of arguments.
+ *
+ * @private
+ * @param {Array|Object} args The provided arguments.
+ * @param {Array} partials The arguments to prepend to those provided.
+ * @param {Array} holders The `partials` placeholder indexes.
+ * @returns {Array} Returns the new array of composed arguments.
+ */
+ function composeArgs(args, partials, holders) {
+ var holdersLength = holders.length,
+ argsIndex = -1,
+ argsLength = nativeMax(args.length - holdersLength, 0),
+ leftIndex = -1,
+ leftLength = partials.length,
+ result = Array(leftLength + argsLength);
+
+ while (++leftIndex < leftLength) {
+ result[leftIndex] = partials[leftIndex];
+ }
+ while (++argsIndex < holdersLength) {
+ result[holders[argsIndex]] = args[argsIndex];
+ }
+ while (argsLength--) {
+ result[leftIndex++] = args[argsIndex++];
+ }
+ return result;
+ }
+
+ /**
+ * This function is like `composeArgs` except that the arguments composition
+ * is tailored for `_.partialRight`.
+ *
+ * @private
+ * @param {Array|Object} args The provided arguments.
+ * @param {Array} partials The arguments to append to those provided.
+ * @param {Array} holders The `partials` placeholder indexes.
+ * @returns {Array} Returns the new array of composed arguments.
+ */
+ function composeArgsRight(args, partials, holders) {
+ var holdersIndex = -1,
+ holdersLength = holders.length,
+ argsIndex = -1,
+ argsLength = nativeMax(args.length - holdersLength, 0),
+ rightIndex = -1,
+ rightLength = partials.length,
+ result = Array(argsLength + rightLength);
+
+ while (++argsIndex < argsLength) {
+ result[argsIndex] = args[argsIndex];
+ }
+ var offset = argsIndex;
+ while (++rightIndex < rightLength) {
+ result[offset + rightIndex] = partials[rightIndex];
+ }
+ while (++holdersIndex < holdersLength) {
+ result[offset + holders[holdersIndex]] = args[argsIndex++];
+ }
+ return result;
+ }
+
+ /**
+ * Creates a `_.countBy`, `_.groupBy`, `_.indexBy`, or `_.partition` function.
+ *
+ * @private
+ * @param {Function} setter The function to set keys and values of the accumulator object.
+ * @param {Function} [initializer] The function to initialize the accumulator object.
+ * @returns {Function} Returns the new aggregator function.
+ */
+ function createAggregator(setter, initializer) {
+ return function(collection, iteratee, thisArg) {
+ var result = initializer ? initializer() : {};
+ iteratee = getCallback(iteratee, thisArg, 3);
+
+ if (isArray(collection)) {
+ var index = -1,
+ length = collection.length;
+
+ while (++index < length) {
+ var value = collection[index];
+ setter(result, value, iteratee(value, index, collection), collection);
+ }
+ } else {
+ baseEach(collection, function(value, key, collection) {
+ setter(result, value, iteratee(value, key, collection), collection);
+ });
+ }
+ return result;
+ };
+ }
+
+ /**
+ * Creates a `_.assign`, `_.defaults`, or `_.merge` function.
+ *
+ * @private
+ * @param {Function} assigner The function to assign values.
+ * @returns {Function} Returns the new assigner function.
+ */
+ function createAssigner(assigner) {
+ return restParam(function(object, sources) {
+ var index = -1,
+ length = object == null ? 0 : sources.length,
+ customizer = length > 2 ? sources[length - 2] : undefined,
+ guard = length > 2 ? sources[2] : undefined,
+ thisArg = length > 1 ? sources[length - 1] : undefined;
+
+ if (typeof customizer == 'function') {
+ customizer = bindCallback(customizer, thisArg, 5);
+ length -= 2;
+ } else {
+ customizer = typeof thisArg == 'function' ? thisArg : undefined;
+ length -= (customizer ? 1 : 0);
+ }
+ if (guard && isIterateeCall(sources[0], sources[1], guard)) {
+ customizer = length < 3 ? undefined : customizer;
+ length = 1;
+ }
+ while (++index < length) {
+ var source = sources[index];
+ if (source) {
+ assigner(object, source, customizer);
+ }
+ }
+ return object;
+ });
+ }
+
+ /**
+ * Creates a `baseEach` or `baseEachRight` function.
+ *
+ * @private
+ * @param {Function} eachFunc The function to iterate over a collection.
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Function} Returns the new base function.
+ */
+ function createBaseEach(eachFunc, fromRight) {
+ return function(collection, iteratee) {
+ var length = collection ? getLength(collection) : 0;
+ if (!isLength(length)) {
+ return eachFunc(collection, iteratee);
+ }
+ var index = fromRight ? length : -1,
+ iterable = toObject(collection);
+
+ while ((fromRight ? index-- : ++index < length)) {
+ if (iteratee(iterable[index], index, iterable) === false) {
+ break;
+ }
+ }
+ return collection;
+ };
+ }
+
+ /**
+ * Creates a base function for `_.forIn` or `_.forInRight`.
+ *
+ * @private
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Function} Returns the new base function.
+ */
+ function createBaseFor(fromRight) {
+ return function(object, iteratee, keysFunc) {
+ var iterable = toObject(object),
+ props = keysFunc(object),
+ length = props.length,
+ index = fromRight ? length : -1;
+
+ while ((fromRight ? index-- : ++index < length)) {
+ var key = props[index];
+ if (iteratee(iterable[key], key, iterable) === false) {
+ break;
+ }
+ }
+ return object;
+ };
+ }
+
+ /**
+ * Creates a function that wraps `func` and invokes it with the `this`
+ * binding of `thisArg`.
+ *
+ * @private
+ * @param {Function} func The function to bind.
+ * @param {*} [thisArg] The `this` binding of `func`.
+ * @returns {Function} Returns the new bound function.
+ */
+ function createBindWrapper(func, thisArg) {
+ var Ctor = createCtorWrapper(func);
+
+ function wrapper() {
+ var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
+ return fn.apply(thisArg, arguments);
+ }
+ return wrapper;
+ }
+
+ /**
+ * Creates a `Set` cache object to optimize linear searches of large arrays.
+ *
+ * @private
+ * @param {Array} [values] The values to cache.
+ * @returns {null|Object} Returns the new cache object if `Set` is supported, else `null`.
+ */
+ function createCache(values) {
+ return (nativeCreate && Set) ? new SetCache(values) : null;
+ }
+
+ /**
+ * Creates a function that produces compound words out of the words in a
+ * given string.
+ *
+ * @private
+ * @param {Function} callback The function to combine each word.
+ * @returns {Function} Returns the new compounder function.
+ */
+ function createCompounder(callback) {
+ return function(string) {
+ var index = -1,
+ array = words(deburr(string)),
+ length = array.length,
+ result = '';
+
+ while (++index < length) {
+ result = callback(result, array[index], index);
+ }
+ return result;
+ };
+ }
+
+ /**
+ * Creates a function that produces an instance of `Ctor` regardless of
+ * whether it was invoked as part of a `new` expression or by `call` or `apply`.
+ *
+ * @private
+ * @param {Function} Ctor The constructor to wrap.
+ * @returns {Function} Returns the new wrapped function.
+ */
+ function createCtorWrapper(Ctor) {
+ return function() {
+ // Use a `switch` statement to work with class constructors.
+ // See http://ecma-international.org/ecma-262/6.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist
+ // for more details.
+ var args = arguments;
+ switch (args.length) {
+ case 0: return new Ctor;
+ case 1: return new Ctor(args[0]);
+ case 2: return new Ctor(args[0], args[1]);
+ case 3: return new Ctor(args[0], args[1], args[2]);
+ case 4: return new Ctor(args[0], args[1], args[2], args[3]);
+ case 5: return new Ctor(args[0], args[1], args[2], args[3], args[4]);
+ case 6: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5]);
+ case 7: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5], args[6]);
+ }
+ var thisBinding = baseCreate(Ctor.prototype),
+ result = Ctor.apply(thisBinding, args);
+
+ // Mimic the constructor's `return` behavior.
+ // See https://es5.github.io/#x13.2.2 for more details.
+ return isObject(result) ? result : thisBinding;
+ };
+ }
+
+ /**
+ * Creates a `_.curry` or `_.curryRight` function.
+ *
+ * @private
+ * @param {boolean} flag The curry bit flag.
+ * @returns {Function} Returns the new curry function.
+ */
+ function createCurry(flag) {
+ function curryFunc(func, arity, guard) {
+ if (guard && isIterateeCall(func, arity, guard)) {
+ arity = undefined;
+ }
+ var result = createWrapper(func, flag, undefined, undefined, undefined, undefined, undefined, arity);
+ result.placeholder = curryFunc.placeholder;
+ return result;
+ }
+ return curryFunc;
+ }
+
+ /**
+ * Creates a `_.defaults` or `_.defaultsDeep` function.
+ *
+ * @private
+ * @param {Function} assigner The function to assign values.
+ * @param {Function} customizer The function to customize assigned values.
+ * @returns {Function} Returns the new defaults function.
+ */
+ function createDefaults(assigner, customizer) {
+ return restParam(function(args) {
+ var object = args[0];
+ if (object == null) {
+ return object;
+ }
+ args.push(customizer);
+ return assigner.apply(undefined, args);
+ });
+ }
+
+ /**
+ * Creates a `_.max` or `_.min` function.
+ *
+ * @private
+ * @param {Function} comparator The function used to compare values.
+ * @param {*} exValue The initial extremum value.
+ * @returns {Function} Returns the new extremum function.
+ */
+ function createExtremum(comparator, exValue) {
+ return function(collection, iteratee, thisArg) {
+ if (thisArg && isIterateeCall(collection, iteratee, thisArg)) {
+ iteratee = undefined;
+ }
+ iteratee = getCallback(iteratee, thisArg, 3);
+ if (iteratee.length == 1) {
+ collection = isArray(collection) ? collection : toIterable(collection);
+ var result = arrayExtremum(collection, iteratee, comparator, exValue);
+ if (!(collection.length && result === exValue)) {
+ return result;
+ }
+ }
+ return baseExtremum(collection, iteratee, comparator, exValue);
+ };
+ }
+
+ /**
+ * Creates a `_.find` or `_.findLast` function.
+ *
+ * @private
+ * @param {Function} eachFunc The function to iterate over a collection.
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Function} Returns the new find function.
+ */
+ function createFind(eachFunc, fromRight) {
+ return function(collection, predicate, thisArg) {
+ predicate = getCallback(predicate, thisArg, 3);
+ if (isArray(collection)) {
+ var index = baseFindIndex(collection, predicate, fromRight);
+ return index > -1 ? collection[index] : undefined;
+ }
+ return baseFind(collection, predicate, eachFunc);
+ };
+ }
+
+ /**
+ * Creates a `_.findIndex` or `_.findLastIndex` function.
+ *
+ * @private
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Function} Returns the new find function.
+ */
+ function createFindIndex(fromRight) {
+ return function(array, predicate, thisArg) {
+ if (!(array && array.length)) {
+ return -1;
+ }
+ predicate = getCallback(predicate, thisArg, 3);
+ return baseFindIndex(array, predicate, fromRight);
+ };
+ }
+
+ /**
+ * Creates a `_.findKey` or `_.findLastKey` function.
+ *
+ * @private
+ * @param {Function} objectFunc The function to iterate over an object.
+ * @returns {Function} Returns the new find function.
+ */
+ function createFindKey(objectFunc) {
+ return function(object, predicate, thisArg) {
+ predicate = getCallback(predicate, thisArg, 3);
+ return baseFind(object, predicate, objectFunc, true);
+ };
+ }
+
+ /**
+ * Creates a `_.flow` or `_.flowRight` function.
+ *
+ * @private
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Function} Returns the new flow function.
+ */
+ function createFlow(fromRight) {
+ return function() {
+ var wrapper,
+ length = arguments.length,
+ index = fromRight ? length : -1,
+ leftIndex = 0,
+ funcs = Array(length);
+
+ while ((fromRight ? index-- : ++index < length)) {
+ var func = funcs[leftIndex++] = arguments[index];
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ if (!wrapper && LodashWrapper.prototype.thru && getFuncName(func) == 'wrapper') {
+ wrapper = new LodashWrapper([], true);
+ }
+ }
+ index = wrapper ? -1 : length;
+ while (++index < length) {
+ func = funcs[index];
+
+ var funcName = getFuncName(func),
+ data = funcName == 'wrapper' ? getData(func) : undefined;
+
+ if (data && isLaziable(data[0]) && data[1] == (ARY_FLAG | CURRY_FLAG | PARTIAL_FLAG | REARG_FLAG) && !data[4].length && data[9] == 1) {
+ wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
+ } else {
+ wrapper = (func.length == 1 && isLaziable(func)) ? wrapper[funcName]() : wrapper.thru(func);
+ }
+ }
+ return function() {
+ var args = arguments,
+ value = args[0];
+
+ if (wrapper && args.length == 1 && isArray(value) && value.length >= LARGE_ARRAY_SIZE) {
+ return wrapper.plant(value).value();
+ }
+ var index = 0,
+ result = length ? funcs[index].apply(this, args) : value;
+
+ while (++index < length) {
+ result = funcs[index].call(this, result);
+ }
+ return result;
+ };
+ };
+ }
+
+ /**
+ * Creates a function for `_.forEach` or `_.forEachRight`.
+ *
+ * @private
+ * @param {Function} arrayFunc The function to iterate over an array.
+ * @param {Function} eachFunc The function to iterate over a collection.
+ * @returns {Function} Returns the new each function.
+ */
+ function createForEach(arrayFunc, eachFunc) {
+ return function(collection, iteratee, thisArg) {
+ return (typeof iteratee == 'function' && thisArg === undefined && isArray(collection))
+ ? arrayFunc(collection, iteratee)
+ : eachFunc(collection, bindCallback(iteratee, thisArg, 3));
+ };
+ }
+
+ /**
+ * Creates a function for `_.forIn` or `_.forInRight`.
+ *
+ * @private
+ * @param {Function} objectFunc The function to iterate over an object.
+ * @returns {Function} Returns the new each function.
+ */
+ function createForIn(objectFunc) {
+ return function(object, iteratee, thisArg) {
+ if (typeof iteratee != 'function' || thisArg !== undefined) {
+ iteratee = bindCallback(iteratee, thisArg, 3);
+ }
+ return objectFunc(object, iteratee, keysIn);
+ };
+ }
+
+ /**
+ * Creates a function for `_.forOwn` or `_.forOwnRight`.
+ *
+ * @private
+ * @param {Function} objectFunc The function to iterate over an object.
+ * @returns {Function} Returns the new each function.
+ */
+ function createForOwn(objectFunc) {
+ return function(object, iteratee, thisArg) {
+ if (typeof iteratee != 'function' || thisArg !== undefined) {
+ iteratee = bindCallback(iteratee, thisArg, 3);
+ }
+ return objectFunc(object, iteratee);
+ };
+ }
+
+ /**
+ * Creates a function for `_.mapKeys` or `_.mapValues`.
+ *
+ * @private
+ * @param {boolean} [isMapKeys] Specify mapping keys instead of values.
+ * @returns {Function} Returns the new map function.
+ */
+ function createObjectMapper(isMapKeys) {
+ return function(object, iteratee, thisArg) {
+ var result = {};
+ iteratee = getCallback(iteratee, thisArg, 3);
+
+ baseForOwn(object, function(value, key, object) {
+ var mapped = iteratee(value, key, object);
+ key = isMapKeys ? mapped : key;
+ value = isMapKeys ? value : mapped;
+ result[key] = value;
+ });
+ return result;
+ };
+ }
+
+ /**
+ * Creates a function for `_.padLeft` or `_.padRight`.
+ *
+ * @private
+ * @param {boolean} [fromRight] Specify padding from the right.
+ * @returns {Function} Returns the new pad function.
+ */
+ function createPadDir(fromRight) {
+ return function(string, length, chars) {
+ string = baseToString(string);
+ return (fromRight ? string : '') + createPadding(string, length, chars) + (fromRight ? '' : string);
+ };
+ }
+
+ /**
+ * Creates a `_.partial` or `_.partialRight` function.
+ *
+ * @private
+ * @param {boolean} flag The partial bit flag.
+ * @returns {Function} Returns the new partial function.
+ */
+ function createPartial(flag) {
+ var partialFunc = restParam(function(func, partials) {
+ var holders = replaceHolders(partials, partialFunc.placeholder);
+ return createWrapper(func, flag, undefined, partials, holders);
+ });
+ return partialFunc;
+ }
+
+ /**
+ * Creates a function for `_.reduce` or `_.reduceRight`.
+ *
+ * @private
+ * @param {Function} arrayFunc The function to iterate over an array.
+ * @param {Function} eachFunc The function to iterate over a collection.
+ * @returns {Function} Returns the new each function.
+ */
+ function createReduce(arrayFunc, eachFunc) {
+ return function(collection, iteratee, accumulator, thisArg) {
+ var initFromArray = arguments.length < 3;
+ return (typeof iteratee == 'function' && thisArg === undefined && isArray(collection))
+ ? arrayFunc(collection, iteratee, accumulator, initFromArray)
+ : baseReduce(collection, getCallback(iteratee, thisArg, 4), accumulator, initFromArray, eachFunc);
+ };
+ }
+
+ /**
+ * Creates a function that wraps `func` and invokes it with optional `this`
+ * binding of, partial application, and currying.
+ *
+ * @private
+ * @param {Function|string} func The function or method name to reference.
+ * @param {number} bitmask The bitmask of flags. See `createWrapper` for more details.
+ * @param {*} [thisArg] The `this` binding of `func`.
+ * @param {Array} [partials] The arguments to prepend to those provided to the new function.
+ * @param {Array} [holders] The `partials` placeholder indexes.
+ * @param {Array} [partialsRight] The arguments to append to those provided to the new function.
+ * @param {Array} [holdersRight] The `partialsRight` placeholder indexes.
+ * @param {Array} [argPos] The argument positions of the new function.
+ * @param {number} [ary] The arity cap of `func`.
+ * @param {number} [arity] The arity of `func`.
+ * @returns {Function} Returns the new wrapped function.
+ */
+ function createHybridWrapper(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) {
+ var isAry = bitmask & ARY_FLAG,
+ isBind = bitmask & BIND_FLAG,
+ isBindKey = bitmask & BIND_KEY_FLAG,
+ isCurry = bitmask & CURRY_FLAG,
+ isCurryBound = bitmask & CURRY_BOUND_FLAG,
+ isCurryRight = bitmask & CURRY_RIGHT_FLAG,
+ Ctor = isBindKey ? undefined : createCtorWrapper(func);
+
+ function wrapper() {
+ // Avoid `arguments` object use disqualifying optimizations by
+ // converting it to an array before providing it to other functions.
+ var length = arguments.length,
+ index = length,
+ args = Array(length);
+
+ while (index--) {
+ args[index] = arguments[index];
+ }
+ if (partials) {
+ args = composeArgs(args, partials, holders);
+ }
+ if (partialsRight) {
+ args = composeArgsRight(args, partialsRight, holdersRight);
+ }
+ if (isCurry || isCurryRight) {
+ var placeholder = wrapper.placeholder,
+ argsHolders = replaceHolders(args, placeholder);
+
+ length -= argsHolders.length;
+ if (length < arity) {
+ var newArgPos = argPos ? arrayCopy(argPos) : undefined,
+ newArity = nativeMax(arity - length, 0),
+ newsHolders = isCurry ? argsHolders : undefined,
+ newHoldersRight = isCurry ? undefined : argsHolders,
+ newPartials = isCurry ? args : undefined,
+ newPartialsRight = isCurry ? undefined : args;
+
+ bitmask |= (isCurry ? PARTIAL_FLAG : PARTIAL_RIGHT_FLAG);
+ bitmask &= ~(isCurry ? PARTIAL_RIGHT_FLAG : PARTIAL_FLAG);
+
+ if (!isCurryBound) {
+ bitmask &= ~(BIND_FLAG | BIND_KEY_FLAG);
+ }
+ var newData = [func, bitmask, thisArg, newPartials, newsHolders, newPartialsRight, newHoldersRight, newArgPos, ary, newArity],
+ result = createHybridWrapper.apply(undefined, newData);
+
+ if (isLaziable(func)) {
+ setData(result, newData);
+ }
+ result.placeholder = placeholder;
+ return result;
+ }
+ }
+ var thisBinding = isBind ? thisArg : this,
+ fn = isBindKey ? thisBinding[func] : func;
+
+ if (argPos) {
+ args = reorder(args, argPos);
+ }
+ if (isAry && ary < args.length) {
+ args.length = ary;
+ }
+ if (this && this !== root && this instanceof wrapper) {
+ fn = Ctor || createCtorWrapper(func);
+ }
+ return fn.apply(thisBinding, args);
+ }
+ return wrapper;
+ }
+
+ /**
+ * Creates the padding required for `string` based on the given `length`.
+ * The `chars` string is truncated if the number of characters exceeds `length`.
+ *
+ * @private
+ * @param {string} string The string to create padding for.
+ * @param {number} [length=0] The padding length.
+ * @param {string} [chars=' '] The string used as padding.
+ * @returns {string} Returns the pad for `string`.
+ */
+ function createPadding(string, length, chars) {
+ var strLength = string.length;
+ length = +length;
+
+ if (strLength >= length || !nativeIsFinite(length)) {
+ return '';
+ }
+ var padLength = length - strLength;
+ chars = chars == null ? ' ' : (chars + '');
+ return repeat(chars, nativeCeil(padLength / chars.length)).slice(0, padLength);
+ }
+
+ /**
+ * Creates a function that wraps `func` and invokes it with the optional `this`
+ * binding of `thisArg` and the `partials` prepended to those provided to
+ * the wrapper.
+ *
+ * @private
+ * @param {Function} func The function to partially apply arguments to.
+ * @param {number} bitmask The bitmask of flags. See `createWrapper` for more details.
+ * @param {*} thisArg The `this` binding of `func`.
+ * @param {Array} partials The arguments to prepend to those provided to the new function.
+ * @returns {Function} Returns the new bound function.
+ */
+ function createPartialWrapper(func, bitmask, thisArg, partials) {
+ var isBind = bitmask & BIND_FLAG,
+ Ctor = createCtorWrapper(func);
+
+ function wrapper() {
+ // Avoid `arguments` object use disqualifying optimizations by
+ // converting it to an array before providing it `func`.
+ var argsIndex = -1,
+ argsLength = arguments.length,
+ leftIndex = -1,
+ leftLength = partials.length,
+ args = Array(leftLength + argsLength);
+
+ while (++leftIndex < leftLength) {
+ args[leftIndex] = partials[leftIndex];
+ }
+ while (argsLength--) {
+ args[leftIndex++] = arguments[++argsIndex];
+ }
+ var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
+ return fn.apply(isBind ? thisArg : this, args);
+ }
+ return wrapper;
+ }
+
+ /**
+ * Creates a `_.ceil`, `_.floor`, or `_.round` function.
+ *
+ * @private
+ * @param {string} methodName The name of the `Math` method to use when rounding.
+ * @returns {Function} Returns the new round function.
+ */
+ function createRound(methodName) {
+ var func = Math[methodName];
+ return function(number, precision) {
+ precision = precision === undefined ? 0 : (+precision || 0);
+ if (precision) {
+ precision = pow(10, precision);
+ return func(number * precision) / precision;
+ }
+ return func(number);
+ };
+ }
+
+ /**
+ * Creates a `_.sortedIndex` or `_.sortedLastIndex` function.
+ *
+ * @private
+ * @param {boolean} [retHighest] Specify returning the highest qualified index.
+ * @returns {Function} Returns the new index function.
+ */
+ function createSortedIndex(retHighest) {
+ return function(array, value, iteratee, thisArg) {
+ var callback = getCallback(iteratee);
+ return (iteratee == null && callback === baseCallback)
+ ? binaryIndex(array, value, retHighest)
+ : binaryIndexBy(array, value, callback(iteratee, thisArg, 1), retHighest);
+ };
+ }
+
+ /**
+ * Creates a function that either curries or invokes `func` with optional
+ * `this` binding and partially applied arguments.
+ *
+ * @private
+ * @param {Function|string} func The function or method name to reference.
+ * @param {number} bitmask The bitmask of flags.
+ * The bitmask may be composed of the following flags:
+ * 1 - `_.bind`
+ * 2 - `_.bindKey`
+ * 4 - `_.curry` or `_.curryRight` of a bound function
+ * 8 - `_.curry`
+ * 16 - `_.curryRight`
+ * 32 - `_.partial`
+ * 64 - `_.partialRight`
+ * 128 - `_.rearg`
+ * 256 - `_.ary`
+ * @param {*} [thisArg] The `this` binding of `func`.
+ * @param {Array} [partials] The arguments to be partially applied.
+ * @param {Array} [holders] The `partials` placeholder indexes.
+ * @param {Array} [argPos] The argument positions of the new function.
+ * @param {number} [ary] The arity cap of `func`.
+ * @param {number} [arity] The arity of `func`.
+ * @returns {Function} Returns the new wrapped function.
+ */
+ function createWrapper(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
+ var isBindKey = bitmask & BIND_KEY_FLAG;
+ if (!isBindKey && typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ var length = partials ? partials.length : 0;
+ if (!length) {
+ bitmask &= ~(PARTIAL_FLAG | PARTIAL_RIGHT_FLAG);
+ partials = holders = undefined;
+ }
+ length -= (holders ? holders.length : 0);
+ if (bitmask & PARTIAL_RIGHT_FLAG) {
+ var partialsRight = partials,
+ holdersRight = holders;
+
+ partials = holders = undefined;
+ }
+ var data = isBindKey ? undefined : getData(func),
+ newData = [func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity];
+
+ if (data) {
+ mergeData(newData, data);
+ bitmask = newData[1];
+ arity = newData[9];
+ }
+ newData[9] = arity == null
+ ? (isBindKey ? 0 : func.length)
+ : (nativeMax(arity - length, 0) || 0);
+
+ if (bitmask == BIND_FLAG) {
+ var result = createBindWrapper(newData[0], newData[2]);
+ } else if ((bitmask == PARTIAL_FLAG || bitmask == (BIND_FLAG | PARTIAL_FLAG)) && !newData[4].length) {
+ result = createPartialWrapper.apply(undefined, newData);
+ } else {
+ result = createHybridWrapper.apply(undefined, newData);
+ }
+ var setter = data ? baseSetData : setData;
+ return setter(result, newData);
+ }
+
+ /**
+ * A specialized version of `baseIsEqualDeep` for arrays with support for
+ * partial deep comparisons.
+ *
+ * @private
+ * @param {Array} array The array to compare.
+ * @param {Array} other The other array to compare.
+ * @param {Function} equalFunc The function to determine equivalents of values.
+ * @param {Function} [customizer] The function to customize comparing arrays.
+ * @param {boolean} [isLoose] Specify performing partial comparisons.
+ * @param {Array} [stackA] Tracks traversed `value` objects.
+ * @param {Array} [stackB] Tracks traversed `other` objects.
+ * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.
+ */
+ function equalArrays(array, other, equalFunc, customizer, isLoose, stackA, stackB) {
+ var index = -1,
+ arrLength = array.length,
+ othLength = other.length;
+
+ if (arrLength != othLength && !(isLoose && othLength > arrLength)) {
+ return false;
+ }
+ // Ignore non-index properties.
+ while (++index < arrLength) {
+ var arrValue = array[index],
+ othValue = other[index],
+ result = customizer ? customizer(isLoose ? othValue : arrValue, isLoose ? arrValue : othValue, index) : undefined;
+
+ if (result !== undefined) {
+ if (result) {
+ continue;
+ }
+ return false;
+ }
+ // Recursively compare arrays (susceptible to call stack limits).
+ if (isLoose) {
+ if (!arraySome(other, function(othValue) {
+ return arrValue === othValue || equalFunc(arrValue, othValue, customizer, isLoose, stackA, stackB);
+ })) {
+ return false;
+ }
+ } else if (!(arrValue === othValue || equalFunc(arrValue, othValue, customizer, isLoose, stackA, stackB))) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * A specialized version of `baseIsEqualDeep` for comparing objects of
+ * the same `toStringTag`.
+ *
+ * **Note:** This function only supports comparing values with tags of
+ * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
+ *
+ * @private
+ * @param {Object} object The object to compare.
+ * @param {Object} other The other object to compare.
+ * @param {string} tag The `toStringTag` of the objects to compare.
+ * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
+ */
+ function equalByTag(object, other, tag) {
+ switch (tag) {
+ case boolTag:
+ case dateTag:
+ // Coerce dates and booleans to numbers, dates to milliseconds and booleans
+ // to `1` or `0` treating invalid dates coerced to `NaN` as not equal.
+ return +object == +other;
+
+ case errorTag:
+ return object.name == other.name && object.message == other.message;
+
+ case numberTag:
+ // Treat `NaN` vs. `NaN` as equal.
+ return (object != +object)
+ ? other != +other
+ : object == +other;
+
+ case regexpTag:
+ case stringTag:
+ // Coerce regexes to strings and treat strings primitives and string
+ // objects as equal. See https://es5.github.io/#x15.10.6.4 for more details.
+ return object == (other + '');
+ }
+ return false;
+ }
+
+ /**
+ * A specialized version of `baseIsEqualDeep` for objects with support for
+ * partial deep comparisons.
+ *
+ * @private
+ * @param {Object} object The object to compare.
+ * @param {Object} other The other object to compare.
+ * @param {Function} equalFunc The function to determine equivalents of values.
+ * @param {Function} [customizer] The function to customize comparing values.
+ * @param {boolean} [isLoose] Specify performing partial comparisons.
+ * @param {Array} [stackA] Tracks traversed `value` objects.
+ * @param {Array} [stackB] Tracks traversed `other` objects.
+ * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
+ */
+ function equalObjects(object, other, equalFunc, customizer, isLoose, stackA, stackB) {
+ var objProps = keys(object),
+ objLength = objProps.length,
+ othProps = keys(other),
+ othLength = othProps.length;
+
+ if (objLength != othLength && !isLoose) {
+ return false;
+ }
+ var index = objLength;
+ while (index--) {
+ var key = objProps[index];
+ if (!(isLoose ? key in other : hasOwnProperty.call(other, key))) {
+ return false;
+ }
+ }
+ var skipCtor = isLoose;
+ while (++index < objLength) {
+ key = objProps[index];
+ var objValue = object[key],
+ othValue = other[key],
+ result = customizer ? customizer(isLoose ? othValue : objValue, isLoose? objValue : othValue, key) : undefined;
+
+ // Recursively compare objects (susceptible to call stack limits).
+ if (!(result === undefined ? equalFunc(objValue, othValue, customizer, isLoose, stackA, stackB) : result)) {
+ return false;
+ }
+ skipCtor || (skipCtor = key == 'constructor');
+ }
+ if (!skipCtor) {
+ var objCtor = object.constructor,
+ othCtor = other.constructor;
+
+ // Non `Object` object instances with different constructors are not equal.
+ if (objCtor != othCtor &&
+ ('constructor' in object && 'constructor' in other) &&
+ !(typeof objCtor == 'function' && objCtor instanceof objCtor &&
+ typeof othCtor == 'function' && othCtor instanceof othCtor)) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * Gets the appropriate "callback" function. If the `_.callback` method is
+ * customized this function returns the custom method, otherwise it returns
+ * the `baseCallback` function. If arguments are provided the chosen function
+ * is invoked with them and its result is returned.
+ *
+ * @private
+ * @returns {Function} Returns the chosen function or its result.
+ */
+ function getCallback(func, thisArg, argCount) {
+ var result = lodash.callback || callback;
+ result = result === callback ? baseCallback : result;
+ return argCount ? result(func, thisArg, argCount) : result;
+ }
+
+ /**
+ * Gets metadata for `func`.
+ *
+ * @private
+ * @param {Function} func The function to query.
+ * @returns {*} Returns the metadata for `func`.
+ */
+ var getData = !metaMap ? noop : function(func) {
+ return metaMap.get(func);
+ };
+
+ /**
+ * Gets the name of `func`.
+ *
+ * @private
+ * @param {Function} func The function to query.
+ * @returns {string} Returns the function name.
+ */
+ function getFuncName(func) {
+ var result = func.name,
+ array = realNames[result],
+ length = array ? array.length : 0;
+
+ while (length--) {
+ var data = array[length],
+ otherFunc = data.func;
+ if (otherFunc == null || otherFunc == func) {
+ return data.name;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Gets the appropriate "indexOf" function. If the `_.indexOf` method is
+ * customized this function returns the custom method, otherwise it returns
+ * the `baseIndexOf` function. If arguments are provided the chosen function
+ * is invoked with them and its result is returned.
+ *
+ * @private
+ * @returns {Function|number} Returns the chosen function or its result.
+ */
+ function getIndexOf(collection, target, fromIndex) {
+ var result = lodash.indexOf || indexOf;
+ result = result === indexOf ? baseIndexOf : result;
+ return collection ? result(collection, target, fromIndex) : result;
+ }
+
+ /**
+ * Gets the "length" property value of `object`.
+ *
+ * **Note:** This function is used to avoid a [JIT bug](https://bugs.webkit.org/show_bug.cgi?id=142792)
+ * that affects Safari on at least iOS 8.1-8.3 ARM64.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {*} Returns the "length" value.
+ */
+ var getLength = baseProperty('length');
+
+ /**
+ * Gets the propery names, values, and compare flags of `object`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the match data of `object`.
+ */
+ function getMatchData(object) {
+ var result = pairs(object),
+ length = result.length;
+
+ while (length--) {
+ result[length][2] = isStrictComparable(result[length][1]);
+ }
+ return result;
+ }
+
+ /**
+ * Gets the native function at `key` of `object`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {string} key The key of the method to get.
+ * @returns {*} Returns the function if it's native, else `undefined`.
+ */
+ function getNative(object, key) {
+ var value = object == null ? undefined : object[key];
+ return isNative(value) ? value : undefined;
+ }
+
+ /**
+ * Gets the view, applying any `transforms` to the `start` and `end` positions.
+ *
+ * @private
+ * @param {number} start The start of the view.
+ * @param {number} end The end of the view.
+ * @param {Array} transforms The transformations to apply to the view.
+ * @returns {Object} Returns an object containing the `start` and `end`
+ * positions of the view.
+ */
+ function getView(start, end, transforms) {
+ var index = -1,
+ length = transforms.length;
+
+ while (++index < length) {
+ var data = transforms[index],
+ size = data.size;
+
+ switch (data.type) {
+ case 'drop': start += size; break;
+ case 'dropRight': end -= size; break;
+ case 'take': end = nativeMin(end, start + size); break;
+ case 'takeRight': start = nativeMax(start, end - size); break;
+ }
+ }
+ return { 'start': start, 'end': end };
+ }
+
+ /**
+ * Initializes an array clone.
+ *
+ * @private
+ * @param {Array} array The array to clone.
+ * @returns {Array} Returns the initialized clone.
+ */
+ function initCloneArray(array) {
+ var length = array.length,
+ result = new array.constructor(length);
+
+ // Add array properties assigned by `RegExp#exec`.
+ if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {
+ result.index = array.index;
+ result.input = array.input;
+ }
+ return result;
+ }
+
+ /**
+ * Initializes an object clone.
+ *
+ * @private
+ * @param {Object} object The object to clone.
+ * @returns {Object} Returns the initialized clone.
+ */
+ function initCloneObject(object) {
+ var Ctor = object.constructor;
+ if (!(typeof Ctor == 'function' && Ctor instanceof Ctor)) {
+ Ctor = Object;
+ }
+ return new Ctor;
+ }
+
+ /**
+ * Initializes an object clone based on its `toStringTag`.
+ *
+ * **Note:** This function only supports cloning values with tags of
+ * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
+ *
+ * @private
+ * @param {Object} object The object to clone.
+ * @param {string} tag The `toStringTag` of the object to clone.
+ * @param {boolean} [isDeep] Specify a deep clone.
+ * @returns {Object} Returns the initialized clone.
+ */
+ function initCloneByTag(object, tag, isDeep) {
+ var Ctor = object.constructor;
+ switch (tag) {
+ case arrayBufferTag:
+ return bufferClone(object);
+
+ case boolTag:
+ case dateTag:
+ return new Ctor(+object);
+
+ case float32Tag: case float64Tag:
+ case int8Tag: case int16Tag: case int32Tag:
+ case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:
+ var buffer = object.buffer;
+ return new Ctor(isDeep ? bufferClone(buffer) : buffer, object.byteOffset, object.length);
+
+ case numberTag:
+ case stringTag:
+ return new Ctor(object);
+
+ case regexpTag:
+ var result = new Ctor(object.source, reFlags.exec(object));
+ result.lastIndex = object.lastIndex;
+ }
+ return result;
+ }
+
+ /**
+ * Invokes the method at `path` on `object`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path of the method to invoke.
+ * @param {Array} args The arguments to invoke the method with.
+ * @returns {*} Returns the result of the invoked method.
+ */
+ function invokePath(object, path, args) {
+ if (object != null && !isKey(path, object)) {
+ path = toPath(path);
+ object = path.length == 1 ? object : baseGet(object, baseSlice(path, 0, -1));
+ path = last(path);
+ }
+ var func = object == null ? object : object[path];
+ return func == null ? undefined : func.apply(object, args);
+ }
+
+ /**
+ * Checks if `value` is array-like.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
+ */
+ function isArrayLike(value) {
+ return value != null && isLength(getLength(value));
+ }
+
+ /**
+ * Checks if `value` is a valid array-like index.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
+ * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
+ */
+ function isIndex(value, length) {
+ value = (typeof value == 'number' || reIsUint.test(value)) ? +value : -1;
+ length = length == null ? MAX_SAFE_INTEGER : length;
+ return value > -1 && value % 1 == 0 && value < length;
+ }
+
+ /**
+ * Checks if the provided arguments are from an iteratee call.
+ *
+ * @private
+ * @param {*} value The potential iteratee value argument.
+ * @param {*} index The potential iteratee index or key argument.
+ * @param {*} object The potential iteratee object argument.
+ * @returns {boolean} Returns `true` if the arguments are from an iteratee call, else `false`.
+ */
+ function isIterateeCall(value, index, object) {
+ if (!isObject(object)) {
+ return false;
+ }
+ var type = typeof index;
+ if (type == 'number'
+ ? (isArrayLike(object) && isIndex(index, object.length))
+ : (type == 'string' && index in object)) {
+ var other = object[index];
+ return value === value ? (value === other) : (other !== other);
+ }
+ return false;
+ }
+
+ /**
+ * Checks if `value` is a property name and not a property path.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @param {Object} [object] The object to query keys on.
+ * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
+ */
+ function isKey(value, object) {
+ var type = typeof value;
+ if ((type == 'string' && reIsPlainProp.test(value)) || type == 'number') {
+ return true;
+ }
+ if (isArray(value)) {
+ return false;
+ }
+ var result = !reIsDeepProp.test(value);
+ return result || (object != null && value in toObject(object));
+ }
+
+ /**
+ * Checks if `func` has a lazy counterpart.
+ *
+ * @private
+ * @param {Function} func The function to check.
+ * @returns {boolean} Returns `true` if `func` has a lazy counterpart, else `false`.
+ */
+ function isLaziable(func) {
+ var funcName = getFuncName(func);
+ if (!(funcName in LazyWrapper.prototype)) {
+ return false;
+ }
+ var other = lodash[funcName];
+ if (func === other) {
+ return true;
+ }
+ var data = getData(other);
+ return !!data && func === data[0];
+ }
+
+ /**
+ * Checks if `value` is a valid array-like length.
+ *
+ * **Note:** This function is based on [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
+ */
+ function isLength(value) {
+ return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
+ }
+
+ /**
+ * Checks if `value` is suitable for strict equality comparisons, i.e. `===`.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` if suitable for strict
+ * equality comparisons, else `false`.
+ */
+ function isStrictComparable(value) {
+ return value === value && !isObject(value);
+ }
+
+ /**
+ * Merges the function metadata of `source` into `data`.
+ *
+ * Merging metadata reduces the number of wrappers required to invoke a function.
+ * This is possible because methods like `_.bind`, `_.curry`, and `_.partial`
+ * may be applied regardless of execution order. Methods like `_.ary` and `_.rearg`
+ * augment function arguments, making the order in which they are executed important,
+ * preventing the merging of metadata. However, we make an exception for a safe
+ * common case where curried functions have `_.ary` and or `_.rearg` applied.
+ *
+ * @private
+ * @param {Array} data The destination metadata.
+ * @param {Array} source The source metadata.
+ * @returns {Array} Returns `data`.
+ */
+ function mergeData(data, source) {
+ var bitmask = data[1],
+ srcBitmask = source[1],
+ newBitmask = bitmask | srcBitmask,
+ isCommon = newBitmask < ARY_FLAG;
+
+ var isCombo =
+ (srcBitmask == ARY_FLAG && bitmask == CURRY_FLAG) ||
+ (srcBitmask == ARY_FLAG && bitmask == REARG_FLAG && data[7].length <= source[8]) ||
+ (srcBitmask == (ARY_FLAG | REARG_FLAG) && bitmask == CURRY_FLAG);
+
+ // Exit early if metadata can't be merged.
+ if (!(isCommon || isCombo)) {
+ return data;
+ }
+ // Use source `thisArg` if available.
+ if (srcBitmask & BIND_FLAG) {
+ data[2] = source[2];
+ // Set when currying a bound function.
+ newBitmask |= (bitmask & BIND_FLAG) ? 0 : CURRY_BOUND_FLAG;
+ }
+ // Compose partial arguments.
+ var value = source[3];
+ if (value) {
+ var partials = data[3];
+ data[3] = partials ? composeArgs(partials, value, source[4]) : arrayCopy(value);
+ data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : arrayCopy(source[4]);
+ }
+ // Compose partial right arguments.
+ value = source[5];
+ if (value) {
+ partials = data[5];
+ data[5] = partials ? composeArgsRight(partials, value, source[6]) : arrayCopy(value);
+ data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : arrayCopy(source[6]);
+ }
+ // Use source `argPos` if available.
+ value = source[7];
+ if (value) {
+ data[7] = arrayCopy(value);
+ }
+ // Use source `ary` if it's smaller.
+ if (srcBitmask & ARY_FLAG) {
+ data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]);
+ }
+ // Use source `arity` if one is not provided.
+ if (data[9] == null) {
+ data[9] = source[9];
+ }
+ // Use source `func` and merge bitmasks.
+ data[0] = source[0];
+ data[1] = newBitmask;
+
+ return data;
+ }
+
+ /**
+ * Used by `_.defaultsDeep` to customize its `_.merge` use.
+ *
+ * @private
+ * @param {*} objectValue The destination object property value.
+ * @param {*} sourceValue The source object property value.
+ * @returns {*} Returns the value to assign to the destination object.
+ */
+ function mergeDefaults(objectValue, sourceValue) {
+ return objectValue === undefined ? sourceValue : merge(objectValue, sourceValue, mergeDefaults);
+ }
+
+ /**
+ * A specialized version of `_.pick` which picks `object` properties specified
+ * by `props`.
+ *
+ * @private
+ * @param {Object} object The source object.
+ * @param {string[]} props The property names to pick.
+ * @returns {Object} Returns the new object.
+ */
+ function pickByArray(object, props) {
+ object = toObject(object);
+
+ var index = -1,
+ length = props.length,
+ result = {};
+
+ while (++index < length) {
+ var key = props[index];
+ if (key in object) {
+ result[key] = object[key];
+ }
+ }
+ return result;
+ }
+
+ /**
+ * A specialized version of `_.pick` which picks `object` properties `predicate`
+ * returns truthy for.
+ *
+ * @private
+ * @param {Object} object The source object.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {Object} Returns the new object.
+ */
+ function pickByCallback(object, predicate) {
+ var result = {};
+ baseForIn(object, function(value, key, object) {
+ if (predicate(value, key, object)) {
+ result[key] = value;
+ }
+ });
+ return result;
+ }
+
+ /**
+ * Reorder `array` according to the specified indexes where the element at
+ * the first index is assigned as the first element, the element at
+ * the second index is assigned as the second element, and so on.
+ *
+ * @private
+ * @param {Array} array The array to reorder.
+ * @param {Array} indexes The arranged array indexes.
+ * @returns {Array} Returns `array`.
+ */
+ function reorder(array, indexes) {
+ var arrLength = array.length,
+ length = nativeMin(indexes.length, arrLength),
+ oldArray = arrayCopy(array);
+
+ while (length--) {
+ var index = indexes[length];
+ array[length] = isIndex(index, arrLength) ? oldArray[index] : undefined;
+ }
+ return array;
+ }
+
+ /**
+ * Sets metadata for `func`.
+ *
+ * **Note:** If this function becomes hot, i.e. is invoked a lot in a short
+ * period of time, it will trip its breaker and transition to an identity function
+ * to avoid garbage collection pauses in V8. See [V8 issue 2070](https://code.google.com/p/v8/issues/detail?id=2070)
+ * for more details.
+ *
+ * @private
+ * @param {Function} func The function to associate metadata with.
+ * @param {*} data The metadata.
+ * @returns {Function} Returns `func`.
+ */
+ var setData = (function() {
+ var count = 0,
+ lastCalled = 0;
+
+ return function(key, value) {
+ var stamp = now(),
+ remaining = HOT_SPAN - (stamp - lastCalled);
+
+ lastCalled = stamp;
+ if (remaining > 0) {
+ if (++count >= HOT_COUNT) {
+ return key;
+ }
+ } else {
+ count = 0;
+ }
+ return baseSetData(key, value);
+ };
+ }());
+
+ /**
+ * A fallback implementation of `Object.keys` which creates an array of the
+ * own enumerable property names of `object`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names.
+ */
+ function shimKeys(object) {
+ var props = keysIn(object),
+ propsLength = props.length,
+ length = propsLength && object.length;
+
+ var allowIndexes = !!length && isLength(length) &&
+ (isArray(object) || isArguments(object));
+
+ var index = -1,
+ result = [];
+
+ while (++index < propsLength) {
+ var key = props[index];
+ if ((allowIndexes && isIndex(key, length)) || hasOwnProperty.call(object, key)) {
+ result.push(key);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Converts `value` to an array-like object if it's not one.
+ *
+ * @private
+ * @param {*} value The value to process.
+ * @returns {Array|Object} Returns the array-like object.
+ */
+ function toIterable(value) {
+ if (value == null) {
+ return [];
+ }
+ if (!isArrayLike(value)) {
+ return values(value);
+ }
+ return isObject(value) ? value : Object(value);
+ }
+
+ /**
+ * Converts `value` to an object if it's not one.
+ *
+ * @private
+ * @param {*} value The value to process.
+ * @returns {Object} Returns the object.
+ */
+ function toObject(value) {
+ return isObject(value) ? value : Object(value);
+ }
+
+ /**
+ * Converts `value` to property path array if it's not one.
+ *
+ * @private
+ * @param {*} value The value to process.
+ * @returns {Array} Returns the property path array.
+ */
+ function toPath(value) {
+ if (isArray(value)) {
+ return value;
+ }
+ var result = [];
+ baseToString(value).replace(rePropName, function(match, number, quote, string) {
+ result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
+ });
+ return result;
+ }
+
+ /**
+ * Creates a clone of `wrapper`.
+ *
+ * @private
+ * @param {Object} wrapper The wrapper to clone.
+ * @returns {Object} Returns the cloned wrapper.
+ */
+ function wrapperClone(wrapper) {
+ return wrapper instanceof LazyWrapper
+ ? wrapper.clone()
+ : new LodashWrapper(wrapper.__wrapped__, wrapper.__chain__, arrayCopy(wrapper.__actions__));
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates an array of elements split into groups the length of `size`.
+ * If `collection` can't be split evenly, the final chunk will be the remaining
+ * elements.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to process.
+ * @param {number} [size=1] The length of each chunk.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Array} Returns the new array containing chunks.
+ * @example
+ *
+ * _.chunk(['a', 'b', 'c', 'd'], 2);
+ * // => [['a', 'b'], ['c', 'd']]
+ *
+ * _.chunk(['a', 'b', 'c', 'd'], 3);
+ * // => [['a', 'b', 'c'], ['d']]
+ */
+ function chunk(array, size, guard) {
+ if (guard ? isIterateeCall(array, size, guard) : size == null) {
+ size = 1;
+ } else {
+ size = nativeMax(nativeFloor(size) || 1, 1);
+ }
+ var index = 0,
+ length = array ? array.length : 0,
+ resIndex = -1,
+ result = Array(nativeCeil(length / size));
+
+ while (index < length) {
+ result[++resIndex] = baseSlice(array, index, (index += size));
+ }
+ return result;
+ }
+
+ /**
+ * Creates an array with all falsey values removed. The values `false`, `null`,
+ * `0`, `""`, `undefined`, and `NaN` are falsey.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to compact.
+ * @returns {Array} Returns the new array of filtered values.
+ * @example
+ *
+ * _.compact([0, 1, false, 2, '', 3]);
+ * // => [1, 2, 3]
+ */
+ function compact(array) {
+ var index = -1,
+ length = array ? array.length : 0,
+ resIndex = -1,
+ result = [];
+
+ while (++index < length) {
+ var value = array[index];
+ if (value) {
+ result[++resIndex] = value;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Creates an array of unique `array` values not included in the other
+ * provided arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * for equality comparisons.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {...Array} [values] The arrays of values to exclude.
+ * @returns {Array} Returns the new array of filtered values.
+ * @example
+ *
+ * _.difference([1, 2, 3], [4, 2]);
+ * // => [1, 3]
+ */
+ var difference = restParam(function(array, values) {
+ return (isObjectLike(array) && isArrayLike(array))
+ ? baseDifference(array, baseFlatten(values, false, true))
+ : [];
+ });
+
+ /**
+ * Creates a slice of `array` with `n` elements dropped from the beginning.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {number} [n=1] The number of elements to drop.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.drop([1, 2, 3]);
+ * // => [2, 3]
+ *
+ * _.drop([1, 2, 3], 2);
+ * // => [3]
+ *
+ * _.drop([1, 2, 3], 5);
+ * // => []
+ *
+ * _.drop([1, 2, 3], 0);
+ * // => [1, 2, 3]
+ */
+ function drop(array, n, guard) {
+ var length = array ? array.length : 0;
+ if (!length) {
+ return [];
+ }
+ if (guard ? isIterateeCall(array, n, guard) : n == null) {
+ n = 1;
+ }
+ return baseSlice(array, n < 0 ? 0 : n);
+ }
+
+ /**
+ * Creates a slice of `array` with `n` elements dropped from the end.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {number} [n=1] The number of elements to drop.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.dropRight([1, 2, 3]);
+ * // => [1, 2]
+ *
+ * _.dropRight([1, 2, 3], 2);
+ * // => [1]
+ *
+ * _.dropRight([1, 2, 3], 5);
+ * // => []
+ *
+ * _.dropRight([1, 2, 3], 0);
+ * // => [1, 2, 3]
+ */
+ function dropRight(array, n, guard) {
+ var length = array ? array.length : 0;
+ if (!length) {
+ return [];
+ }
+ if (guard ? isIterateeCall(array, n, guard) : n == null) {
+ n = 1;
+ }
+ n = length - (+n || 0);
+ return baseSlice(array, 0, n < 0 ? 0 : n);
+ }
+
+ /**
+ * Creates a slice of `array` excluding elements dropped from the end.
+ * Elements are dropped until `predicate` returns falsey. The predicate is
+ * bound to `thisArg` and invoked with three arguments: (value, index, array).
+ *
+ * If a property name is provided for `predicate` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `predicate` the created `_.matches` style
+ * callback returns `true` for elements that match the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.dropRightWhile([1, 2, 3], function(n) {
+ * return n > 1;
+ * });
+ * // => [1]
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': true },
+ * { 'user': 'fred', 'active': false },
+ * { 'user': 'pebbles', 'active': false }
+ * ];
+ *
+ * // using the `_.matches` callback shorthand
+ * _.pluck(_.dropRightWhile(users, { 'user': 'pebbles', 'active': false }), 'user');
+ * // => ['barney', 'fred']
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.pluck(_.dropRightWhile(users, 'active', false), 'user');
+ * // => ['barney']
+ *
+ * // using the `_.property` callback shorthand
+ * _.pluck(_.dropRightWhile(users, 'active'), 'user');
+ * // => ['barney', 'fred', 'pebbles']
+ */
+ function dropRightWhile(array, predicate, thisArg) {
+ return (array && array.length)
+ ? baseWhile(array, getCallback(predicate, thisArg, 3), true, true)
+ : [];
+ }
+
+ /**
+ * Creates a slice of `array` excluding elements dropped from the beginning.
+ * Elements are dropped until `predicate` returns falsey. The predicate is
+ * bound to `thisArg` and invoked with three arguments: (value, index, array).
+ *
+ * If a property name is provided for `predicate` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `predicate` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.dropWhile([1, 2, 3], function(n) {
+ * return n < 3;
+ * });
+ * // => [3]
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': false },
+ * { 'user': 'fred', 'active': false },
+ * { 'user': 'pebbles', 'active': true }
+ * ];
+ *
+ * // using the `_.matches` callback shorthand
+ * _.pluck(_.dropWhile(users, { 'user': 'barney', 'active': false }), 'user');
+ * // => ['fred', 'pebbles']
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.pluck(_.dropWhile(users, 'active', false), 'user');
+ * // => ['pebbles']
+ *
+ * // using the `_.property` callback shorthand
+ * _.pluck(_.dropWhile(users, 'active'), 'user');
+ * // => ['barney', 'fred', 'pebbles']
+ */
+ function dropWhile(array, predicate, thisArg) {
+ return (array && array.length)
+ ? baseWhile(array, getCallback(predicate, thisArg, 3), true)
+ : [];
+ }
+
+ /**
+ * Fills elements of `array` with `value` from `start` up to, but not
+ * including, `end`.
+ *
+ * **Note:** This method mutates `array`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to fill.
+ * @param {*} value The value to fill `array` with.
+ * @param {number} [start=0] The start position.
+ * @param {number} [end=array.length] The end position.
+ * @returns {Array} Returns `array`.
+ * @example
+ *
+ * var array = [1, 2, 3];
+ *
+ * _.fill(array, 'a');
+ * console.log(array);
+ * // => ['a', 'a', 'a']
+ *
+ * _.fill(Array(3), 2);
+ * // => [2, 2, 2]
+ *
+ * _.fill([4, 6, 8], '*', 1, 2);
+ * // => [4, '*', 8]
+ */
+ function fill(array, value, start, end) {
+ var length = array ? array.length : 0;
+ if (!length) {
+ return [];
+ }
+ if (start && typeof start != 'number' && isIterateeCall(array, value, start)) {
+ start = 0;
+ end = length;
+ }
+ return baseFill(array, value, start, end);
+ }
+
+ /**
+ * This method is like `_.find` except that it returns the index of the first
+ * element `predicate` returns truthy for instead of the element itself.
+ *
+ * If a property name is provided for `predicate` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `predicate` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to search.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {number} Returns the index of the found element, else `-1`.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': false },
+ * { 'user': 'fred', 'active': false },
+ * { 'user': 'pebbles', 'active': true }
+ * ];
+ *
+ * _.findIndex(users, function(chr) {
+ * return chr.user == 'barney';
+ * });
+ * // => 0
+ *
+ * // using the `_.matches` callback shorthand
+ * _.findIndex(users, { 'user': 'fred', 'active': false });
+ * // => 1
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.findIndex(users, 'active', false);
+ * // => 0
+ *
+ * // using the `_.property` callback shorthand
+ * _.findIndex(users, 'active');
+ * // => 2
+ */
+ var findIndex = createFindIndex();
+
+ /**
+ * This method is like `_.findIndex` except that it iterates over elements
+ * of `collection` from right to left.
+ *
+ * If a property name is provided for `predicate` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `predicate` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to search.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {number} Returns the index of the found element, else `-1`.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': true },
+ * { 'user': 'fred', 'active': false },
+ * { 'user': 'pebbles', 'active': false }
+ * ];
+ *
+ * _.findLastIndex(users, function(chr) {
+ * return chr.user == 'pebbles';
+ * });
+ * // => 2
+ *
+ * // using the `_.matches` callback shorthand
+ * _.findLastIndex(users, { 'user': 'barney', 'active': true });
+ * // => 0
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.findLastIndex(users, 'active', false);
+ * // => 2
+ *
+ * // using the `_.property` callback shorthand
+ * _.findLastIndex(users, 'active');
+ * // => 0
+ */
+ var findLastIndex = createFindIndex(true);
+
+ /**
+ * Gets the first element of `array`.
+ *
+ * @static
+ * @memberOf _
+ * @alias head
+ * @category Array
+ * @param {Array} array The array to query.
+ * @returns {*} Returns the first element of `array`.
+ * @example
+ *
+ * _.first([1, 2, 3]);
+ * // => 1
+ *
+ * _.first([]);
+ * // => undefined
+ */
+ function first(array) {
+ return array ? array[0] : undefined;
+ }
+
+ /**
+ * Flattens a nested array. If `isDeep` is `true` the array is recursively
+ * flattened, otherwise it is only flattened a single level.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to flatten.
+ * @param {boolean} [isDeep] Specify a deep flatten.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Array} Returns the new flattened array.
+ * @example
+ *
+ * _.flatten([1, [2, 3, [4]]]);
+ * // => [1, 2, 3, [4]]
+ *
+ * // using `isDeep`
+ * _.flatten([1, [2, 3, [4]]], true);
+ * // => [1, 2, 3, 4]
+ */
+ function flatten(array, isDeep, guard) {
+ var length = array ? array.length : 0;
+ if (guard && isIterateeCall(array, isDeep, guard)) {
+ isDeep = false;
+ }
+ return length ? baseFlatten(array, isDeep) : [];
+ }
+
+ /**
+ * Recursively flattens a nested array.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to recursively flatten.
+ * @returns {Array} Returns the new flattened array.
+ * @example
+ *
+ * _.flattenDeep([1, [2, 3, [4]]]);
+ * // => [1, 2, 3, 4]
+ */
+ function flattenDeep(array) {
+ var length = array ? array.length : 0;
+ return length ? baseFlatten(array, true) : [];
+ }
+
+ /**
+ * Gets the index at which the first occurrence of `value` is found in `array`
+ * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * for equality comparisons. If `fromIndex` is negative, it is used as the offset
+ * from the end of `array`. If `array` is sorted providing `true` for `fromIndex`
+ * performs a faster binary search.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to search.
+ * @param {*} value The value to search for.
+ * @param {boolean|number} [fromIndex=0] The index to search from or `true`
+ * to perform a binary search on a sorted array.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ * @example
+ *
+ * _.indexOf([1, 2, 1, 2], 2);
+ * // => 1
+ *
+ * // using `fromIndex`
+ * _.indexOf([1, 2, 1, 2], 2, 2);
+ * // => 3
+ *
+ * // performing a binary search
+ * _.indexOf([1, 1, 2, 2], 2, true);
+ * // => 2
+ */
+ function indexOf(array, value, fromIndex) {
+ var length = array ? array.length : 0;
+ if (!length) {
+ return -1;
+ }
+ if (typeof fromIndex == 'number') {
+ fromIndex = fromIndex < 0 ? nativeMax(length + fromIndex, 0) : fromIndex;
+ } else if (fromIndex) {
+ var index = binaryIndex(array, value);
+ if (index < length &&
+ (value === value ? (value === array[index]) : (array[index] !== array[index]))) {
+ return index;
+ }
+ return -1;
+ }
+ return baseIndexOf(array, value, fromIndex || 0);
+ }
+
+ /**
+ * Gets all but the last element of `array`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to query.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.initial([1, 2, 3]);
+ * // => [1, 2]
+ */
+ function initial(array) {
+ return dropRight(array, 1);
+ }
+
+ /**
+ * Creates an array of unique values that are included in all of the provided
+ * arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * for equality comparisons.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @returns {Array} Returns the new array of shared values.
+ * @example
+ * _.intersection([1, 2], [4, 2], [2, 1]);
+ * // => [2]
+ */
+ var intersection = restParam(function(arrays) {
+ var othLength = arrays.length,
+ othIndex = othLength,
+ caches = Array(length),
+ indexOf = getIndexOf(),
+ isCommon = indexOf == baseIndexOf,
+ result = [];
+
+ while (othIndex--) {
+ var value = arrays[othIndex] = isArrayLike(value = arrays[othIndex]) ? value : [];
+ caches[othIndex] = (isCommon && value.length >= 120) ? createCache(othIndex && value) : null;
+ }
+ var array = arrays[0],
+ index = -1,
+ length = array ? array.length : 0,
+ seen = caches[0];
+
+ outer:
+ while (++index < length) {
+ value = array[index];
+ if ((seen ? cacheIndexOf(seen, value) : indexOf(result, value, 0)) < 0) {
+ var othIndex = othLength;
+ while (--othIndex) {
+ var cache = caches[othIndex];
+ if ((cache ? cacheIndexOf(cache, value) : indexOf(arrays[othIndex], value, 0)) < 0) {
+ continue outer;
+ }
+ }
+ if (seen) {
+ seen.push(value);
+ }
+ result.push(value);
+ }
+ }
+ return result;
+ });
+
+ /**
+ * Gets the last element of `array`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to query.
+ * @returns {*} Returns the last element of `array`.
+ * @example
+ *
+ * _.last([1, 2, 3]);
+ * // => 3
+ */
+ function last(array) {
+ var length = array ? array.length : 0;
+ return length ? array[length - 1] : undefined;
+ }
+
+ /**
+ * This method is like `_.indexOf` except that it iterates over elements of
+ * `array` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to search.
+ * @param {*} value The value to search for.
+ * @param {boolean|number} [fromIndex=array.length-1] The index to search from
+ * or `true` to perform a binary search on a sorted array.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ * @example
+ *
+ * _.lastIndexOf([1, 2, 1, 2], 2);
+ * // => 3
+ *
+ * // using `fromIndex`
+ * _.lastIndexOf([1, 2, 1, 2], 2, 2);
+ * // => 1
+ *
+ * // performing a binary search
+ * _.lastIndexOf([1, 1, 2, 2], 2, true);
+ * // => 3
+ */
+ function lastIndexOf(array, value, fromIndex) {
+ var length = array ? array.length : 0;
+ if (!length) {
+ return -1;
+ }
+ var index = length;
+ if (typeof fromIndex == 'number') {
+ index = (fromIndex < 0 ? nativeMax(length + fromIndex, 0) : nativeMin(fromIndex || 0, length - 1)) + 1;
+ } else if (fromIndex) {
+ index = binaryIndex(array, value, true) - 1;
+ var other = array[index];
+ if (value === value ? (value === other) : (other !== other)) {
+ return index;
+ }
+ return -1;
+ }
+ if (value !== value) {
+ return indexOfNaN(array, index, true);
+ }
+ while (index--) {
+ if (array[index] === value) {
+ return index;
+ }
+ }
+ return -1;
+ }
+
+ /**
+ * Removes all provided values from `array` using
+ * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * for equality comparisons.
+ *
+ * **Note:** Unlike `_.without`, this method mutates `array`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {...*} [values] The values to remove.
+ * @returns {Array} Returns `array`.
+ * @example
+ *
+ * var array = [1, 2, 3, 1, 2, 3];
+ *
+ * _.pull(array, 2, 3);
+ * console.log(array);
+ * // => [1, 1]
+ */
+ function pull() {
+ var args = arguments,
+ array = args[0];
+
+ if (!(array && array.length)) {
+ return array;
+ }
+ var index = 0,
+ indexOf = getIndexOf(),
+ length = args.length;
+
+ while (++index < length) {
+ var fromIndex = 0,
+ value = args[index];
+
+ while ((fromIndex = indexOf(array, value, fromIndex)) > -1) {
+ splice.call(array, fromIndex, 1);
+ }
+ }
+ return array;
+ }
+
+ /**
+ * Removes elements from `array` corresponding to the given indexes and returns
+ * an array of the removed elements. Indexes may be specified as an array of
+ * indexes or as individual arguments.
+ *
+ * **Note:** Unlike `_.at`, this method mutates `array`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {...(number|number[])} [indexes] The indexes of elements to remove,
+ * specified as individual indexes or arrays of indexes.
+ * @returns {Array} Returns the new array of removed elements.
+ * @example
+ *
+ * var array = [5, 10, 15, 20];
+ * var evens = _.pullAt(array, 1, 3);
+ *
+ * console.log(array);
+ * // => [5, 15]
+ *
+ * console.log(evens);
+ * // => [10, 20]
+ */
+ var pullAt = restParam(function(array, indexes) {
+ indexes = baseFlatten(indexes);
+
+ var result = baseAt(array, indexes);
+ basePullAt(array, indexes.sort(baseCompareAscending));
+ return result;
+ });
+
+ /**
+ * Removes all elements from `array` that `predicate` returns truthy for
+ * and returns an array of the removed elements. The predicate is bound to
+ * `thisArg` and invoked with three arguments: (value, index, array).
+ *
+ * If a property name is provided for `predicate` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `predicate` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * **Note:** Unlike `_.filter`, this method mutates `array`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Array} Returns the new array of removed elements.
+ * @example
+ *
+ * var array = [1, 2, 3, 4];
+ * var evens = _.remove(array, function(n) {
+ * return n % 2 == 0;
+ * });
+ *
+ * console.log(array);
+ * // => [1, 3]
+ *
+ * console.log(evens);
+ * // => [2, 4]
+ */
+ function remove(array, predicate, thisArg) {
+ var result = [];
+ if (!(array && array.length)) {
+ return result;
+ }
+ var index = -1,
+ indexes = [],
+ length = array.length;
+
+ predicate = getCallback(predicate, thisArg, 3);
+ while (++index < length) {
+ var value = array[index];
+ if (predicate(value, index, array)) {
+ result.push(value);
+ indexes.push(index);
+ }
+ }
+ basePullAt(array, indexes);
+ return result;
+ }
+
+ /**
+ * Gets all but the first element of `array`.
+ *
+ * @static
+ * @memberOf _
+ * @alias tail
+ * @category Array
+ * @param {Array} array The array to query.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.rest([1, 2, 3]);
+ * // => [2, 3]
+ */
+ function rest(array) {
+ return drop(array, 1);
+ }
+
+ /**
+ * Creates a slice of `array` from `start` up to, but not including, `end`.
+ *
+ * **Note:** This method is used instead of `Array#slice` to support node
+ * lists in IE < 9 and to ensure dense arrays are returned.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to slice.
+ * @param {number} [start=0] The start position.
+ * @param {number} [end=array.length] The end position.
+ * @returns {Array} Returns the slice of `array`.
+ */
+ function slice(array, start, end) {
+ var length = array ? array.length : 0;
+ if (!length) {
+ return [];
+ }
+ if (end && typeof end != 'number' && isIterateeCall(array, start, end)) {
+ start = 0;
+ end = length;
+ }
+ return baseSlice(array, start, end);
+ }
+
+ /**
+ * Uses a binary search to determine the lowest index at which `value` should
+ * be inserted into `array` in order to maintain its sort order. If an iteratee
+ * function is provided it is invoked for `value` and each element of `array`
+ * to compute their sort ranking. The iteratee is bound to `thisArg` and
+ * invoked with one argument; (value).
+ *
+ * If a property name is provided for `iteratee` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `iteratee` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {number} Returns the index at which `value` should be inserted
+ * into `array`.
+ * @example
+ *
+ * _.sortedIndex([30, 50], 40);
+ * // => 1
+ *
+ * _.sortedIndex([4, 4, 5, 5], 5);
+ * // => 2
+ *
+ * var dict = { 'data': { 'thirty': 30, 'forty': 40, 'fifty': 50 } };
+ *
+ * // using an iteratee function
+ * _.sortedIndex(['thirty', 'fifty'], 'forty', function(word) {
+ * return this.data[word];
+ * }, dict);
+ * // => 1
+ *
+ * // using the `_.property` callback shorthand
+ * _.sortedIndex([{ 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x');
+ * // => 1
+ */
+ var sortedIndex = createSortedIndex();
+
+ /**
+ * This method is like `_.sortedIndex` except that it returns the highest
+ * index at which `value` should be inserted into `array` in order to
+ * maintain its sort order.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {number} Returns the index at which `value` should be inserted
+ * into `array`.
+ * @example
+ *
+ * _.sortedLastIndex([4, 4, 5, 5], 5);
+ * // => 4
+ */
+ var sortedLastIndex = createSortedIndex(true);
+
+ /**
+ * Creates a slice of `array` with `n` elements taken from the beginning.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {number} [n=1] The number of elements to take.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.take([1, 2, 3]);
+ * // => [1]
+ *
+ * _.take([1, 2, 3], 2);
+ * // => [1, 2]
+ *
+ * _.take([1, 2, 3], 5);
+ * // => [1, 2, 3]
+ *
+ * _.take([1, 2, 3], 0);
+ * // => []
+ */
+ function take(array, n, guard) {
+ var length = array ? array.length : 0;
+ if (!length) {
+ return [];
+ }
+ if (guard ? isIterateeCall(array, n, guard) : n == null) {
+ n = 1;
+ }
+ return baseSlice(array, 0, n < 0 ? 0 : n);
+ }
+
+ /**
+ * Creates a slice of `array` with `n` elements taken from the end.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {number} [n=1] The number of elements to take.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.takeRight([1, 2, 3]);
+ * // => [3]
+ *
+ * _.takeRight([1, 2, 3], 2);
+ * // => [2, 3]
+ *
+ * _.takeRight([1, 2, 3], 5);
+ * // => [1, 2, 3]
+ *
+ * _.takeRight([1, 2, 3], 0);
+ * // => []
+ */
+ function takeRight(array, n, guard) {
+ var length = array ? array.length : 0;
+ if (!length) {
+ return [];
+ }
+ if (guard ? isIterateeCall(array, n, guard) : n == null) {
+ n = 1;
+ }
+ n = length - (+n || 0);
+ return baseSlice(array, n < 0 ? 0 : n);
+ }
+
+ /**
+ * Creates a slice of `array` with elements taken from the end. Elements are
+ * taken until `predicate` returns falsey. The predicate is bound to `thisArg`
+ * and invoked with three arguments: (value, index, array).
+ *
+ * If a property name is provided for `predicate` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `predicate` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.takeRightWhile([1, 2, 3], function(n) {
+ * return n > 1;
+ * });
+ * // => [2, 3]
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': true },
+ * { 'user': 'fred', 'active': false },
+ * { 'user': 'pebbles', 'active': false }
+ * ];
+ *
+ * // using the `_.matches` callback shorthand
+ * _.pluck(_.takeRightWhile(users, { 'user': 'pebbles', 'active': false }), 'user');
+ * // => ['pebbles']
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.pluck(_.takeRightWhile(users, 'active', false), 'user');
+ * // => ['fred', 'pebbles']
+ *
+ * // using the `_.property` callback shorthand
+ * _.pluck(_.takeRightWhile(users, 'active'), 'user');
+ * // => []
+ */
+ function takeRightWhile(array, predicate, thisArg) {
+ return (array && array.length)
+ ? baseWhile(array, getCallback(predicate, thisArg, 3), false, true)
+ : [];
+ }
+
+ /**
+ * Creates a slice of `array` with elements taken from the beginning. Elements
+ * are taken until `predicate` returns falsey. The predicate is bound to
+ * `thisArg` and invoked with three arguments: (value, index, array).
+ *
+ * If a property name is provided for `predicate` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `predicate` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.takeWhile([1, 2, 3], function(n) {
+ * return n < 3;
+ * });
+ * // => [1, 2]
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': false },
+ * { 'user': 'fred', 'active': false},
+ * { 'user': 'pebbles', 'active': true }
+ * ];
+ *
+ * // using the `_.matches` callback shorthand
+ * _.pluck(_.takeWhile(users, { 'user': 'barney', 'active': false }), 'user');
+ * // => ['barney']
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.pluck(_.takeWhile(users, 'active', false), 'user');
+ * // => ['barney', 'fred']
+ *
+ * // using the `_.property` callback shorthand
+ * _.pluck(_.takeWhile(users, 'active'), 'user');
+ * // => []
+ */
+ function takeWhile(array, predicate, thisArg) {
+ return (array && array.length)
+ ? baseWhile(array, getCallback(predicate, thisArg, 3))
+ : [];
+ }
+
+ /**
+ * Creates an array of unique values, in order, from all of the provided arrays
+ * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * for equality comparisons.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @returns {Array} Returns the new array of combined values.
+ * @example
+ *
+ * _.union([1, 2], [4, 2], [2, 1]);
+ * // => [1, 2, 4]
+ */
+ var union = restParam(function(arrays) {
+ return baseUniq(baseFlatten(arrays, false, true));
+ });
+
+ /**
+ * Creates a duplicate-free version of an array, using
+ * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * for equality comparisons, in which only the first occurence of each element
+ * is kept. Providing `true` for `isSorted` performs a faster search algorithm
+ * for sorted arrays. If an iteratee function is provided it is invoked for
+ * each element in the array to generate the criterion by which uniqueness
+ * is computed. The `iteratee` is bound to `thisArg` and invoked with three
+ * arguments: (value, index, array).
+ *
+ * If a property name is provided for `iteratee` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `iteratee` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias unique
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {boolean} [isSorted] Specify the array is sorted.
+ * @param {Function|Object|string} [iteratee] The function invoked per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Array} Returns the new duplicate-value-free array.
+ * @example
+ *
+ * _.uniq([2, 1, 2]);
+ * // => [2, 1]
+ *
+ * // using `isSorted`
+ * _.uniq([1, 1, 2], true);
+ * // => [1, 2]
+ *
+ * // using an iteratee function
+ * _.uniq([1, 2.5, 1.5, 2], function(n) {
+ * return this.floor(n);
+ * }, Math);
+ * // => [1, 2.5]
+ *
+ * // using the `_.property` callback shorthand
+ * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
+ * // => [{ 'x': 1 }, { 'x': 2 }]
+ */
+ function uniq(array, isSorted, iteratee, thisArg) {
+ var length = array ? array.length : 0;
+ if (!length) {
+ return [];
+ }
+ if (isSorted != null && typeof isSorted != 'boolean') {
+ thisArg = iteratee;
+ iteratee = isIterateeCall(array, isSorted, thisArg) ? undefined : isSorted;
+ isSorted = false;
+ }
+ var callback = getCallback();
+ if (!(iteratee == null && callback === baseCallback)) {
+ iteratee = callback(iteratee, thisArg, 3);
+ }
+ return (isSorted && getIndexOf() == baseIndexOf)
+ ? sortedUniq(array, iteratee)
+ : baseUniq(array, iteratee);
+ }
+
+ /**
+ * This method is like `_.zip` except that it accepts an array of grouped
+ * elements and creates an array regrouping the elements to their pre-zip
+ * configuration.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array of grouped elements to process.
+ * @returns {Array} Returns the new array of regrouped elements.
+ * @example
+ *
+ * var zipped = _.zip(['fred', 'barney'], [30, 40], [true, false]);
+ * // => [['fred', 30, true], ['barney', 40, false]]
+ *
+ * _.unzip(zipped);
+ * // => [['fred', 'barney'], [30, 40], [true, false]]
+ */
+ function unzip(array) {
+ if (!(array && array.length)) {
+ return [];
+ }
+ var index = -1,
+ length = 0;
+
+ array = arrayFilter(array, function(group) {
+ if (isArrayLike(group)) {
+ length = nativeMax(group.length, length);
+ return true;
+ }
+ });
+ var result = Array(length);
+ while (++index < length) {
+ result[index] = arrayMap(array, baseProperty(index));
+ }
+ return result;
+ }
+
+ /**
+ * This method is like `_.unzip` except that it accepts an iteratee to specify
+ * how regrouped values should be combined. The `iteratee` is bound to `thisArg`
+ * and invoked with four arguments: (accumulator, value, index, group).
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array of grouped elements to process.
+ * @param {Function} [iteratee] The function to combine regrouped values.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Array} Returns the new array of regrouped elements.
+ * @example
+ *
+ * var zipped = _.zip([1, 2], [10, 20], [100, 200]);
+ * // => [[1, 10, 100], [2, 20, 200]]
+ *
+ * _.unzipWith(zipped, _.add);
+ * // => [3, 30, 300]
+ */
+ function unzipWith(array, iteratee, thisArg) {
+ var length = array ? array.length : 0;
+ if (!length) {
+ return [];
+ }
+ var result = unzip(array);
+ if (iteratee == null) {
+ return result;
+ }
+ iteratee = bindCallback(iteratee, thisArg, 4);
+ return arrayMap(result, function(group) {
+ return arrayReduce(group, iteratee, undefined, true);
+ });
+ }
+
+ /**
+ * Creates an array excluding all provided values using
+ * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * for equality comparisons.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to filter.
+ * @param {...*} [values] The values to exclude.
+ * @returns {Array} Returns the new array of filtered values.
+ * @example
+ *
+ * _.without([1, 2, 1, 3], 1, 2);
+ * // => [3]
+ */
+ var without = restParam(function(array, values) {
+ return isArrayLike(array)
+ ? baseDifference(array, values)
+ : [];
+ });
+
+ /**
+ * Creates an array of unique values that is the [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
+ * of the provided arrays.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @returns {Array} Returns the new array of values.
+ * @example
+ *
+ * _.xor([1, 2], [4, 2]);
+ * // => [1, 4]
+ */
+ function xor() {
+ var index = -1,
+ length = arguments.length;
+
+ while (++index < length) {
+ var array = arguments[index];
+ if (isArrayLike(array)) {
+ var result = result
+ ? arrayPush(baseDifference(result, array), baseDifference(array, result))
+ : array;
+ }
+ }
+ return result ? baseUniq(result) : [];
+ }
+
+ /**
+ * Creates an array of grouped elements, the first of which contains the first
+ * elements of the given arrays, the second of which contains the second elements
+ * of the given arrays, and so on.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {...Array} [arrays] The arrays to process.
+ * @returns {Array} Returns the new array of grouped elements.
+ * @example
+ *
+ * _.zip(['fred', 'barney'], [30, 40], [true, false]);
+ * // => [['fred', 30, true], ['barney', 40, false]]
+ */
+ var zip = restParam(unzip);
+
+ /**
+ * The inverse of `_.pairs`; this method returns an object composed from arrays
+ * of property names and values. Provide either a single two dimensional array,
+ * e.g. `[[key1, value1], [key2, value2]]` or two arrays, one of property names
+ * and one of corresponding values.
+ *
+ * @static
+ * @memberOf _
+ * @alias object
+ * @category Array
+ * @param {Array} props The property names.
+ * @param {Array} [values=[]] The property values.
+ * @returns {Object} Returns the new object.
+ * @example
+ *
+ * _.zipObject([['fred', 30], ['barney', 40]]);
+ * // => { 'fred': 30, 'barney': 40 }
+ *
+ * _.zipObject(['fred', 'barney'], [30, 40]);
+ * // => { 'fred': 30, 'barney': 40 }
+ */
+ function zipObject(props, values) {
+ var index = -1,
+ length = props ? props.length : 0,
+ result = {};
+
+ if (length && !values && !isArray(props[0])) {
+ values = [];
+ }
+ while (++index < length) {
+ var key = props[index];
+ if (values) {
+ result[key] = values[index];
+ } else if (key) {
+ result[key[0]] = key[1];
+ }
+ }
+ return result;
+ }
+
+ /**
+ * This method is like `_.zip` except that it accepts an iteratee to specify
+ * how grouped values should be combined. The `iteratee` is bound to `thisArg`
+ * and invoked with four arguments: (accumulator, value, index, group).
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {...Array} [arrays] The arrays to process.
+ * @param {Function} [iteratee] The function to combine grouped values.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Array} Returns the new array of grouped elements.
+ * @example
+ *
+ * _.zipWith([1, 2], [10, 20], [100, 200], _.add);
+ * // => [111, 222]
+ */
+ var zipWith = restParam(function(arrays) {
+ var length = arrays.length,
+ iteratee = length > 2 ? arrays[length - 2] : undefined,
+ thisArg = length > 1 ? arrays[length - 1] : undefined;
+
+ if (length > 2 && typeof iteratee == 'function') {
+ length -= 2;
+ } else {
+ iteratee = (length > 1 && typeof thisArg == 'function') ? (--length, thisArg) : undefined;
+ thisArg = undefined;
+ }
+ arrays.length = length;
+ return unzipWith(arrays, iteratee, thisArg);
+ });
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates a `lodash` object that wraps `value` with explicit method
+ * chaining enabled.
+ *
+ * @static
+ * @memberOf _
+ * @category Chain
+ * @param {*} value The value to wrap.
+ * @returns {Object} Returns the new `lodash` wrapper instance.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36 },
+ * { 'user': 'fred', 'age': 40 },
+ * { 'user': 'pebbles', 'age': 1 }
+ * ];
+ *
+ * var youngest = _.chain(users)
+ * .sortBy('age')
+ * .map(function(chr) {
+ * return chr.user + ' is ' + chr.age;
+ * })
+ * .first()
+ * .value();
+ * // => 'pebbles is 1'
+ */
+ function chain(value) {
+ var result = lodash(value);
+ result.__chain__ = true;
+ return result;
+ }
+
+ /**
+ * This method invokes `interceptor` and returns `value`. The interceptor is
+ * bound to `thisArg` and invoked with one argument; (value). The purpose of
+ * this method is to "tap into" a method chain in order to perform operations
+ * on intermediate results within the chain.
+ *
+ * @static
+ * @memberOf _
+ * @category Chain
+ * @param {*} value The value to provide to `interceptor`.
+ * @param {Function} interceptor The function to invoke.
+ * @param {*} [thisArg] The `this` binding of `interceptor`.
+ * @returns {*} Returns `value`.
+ * @example
+ *
+ * _([1, 2, 3])
+ * .tap(function(array) {
+ * array.pop();
+ * })
+ * .reverse()
+ * .value();
+ * // => [2, 1]
+ */
+ function tap(value, interceptor, thisArg) {
+ interceptor.call(thisArg, value);
+ return value;
+ }
+
+ /**
+ * This method is like `_.tap` except that it returns the result of `interceptor`.
+ *
+ * @static
+ * @memberOf _
+ * @category Chain
+ * @param {*} value The value to provide to `interceptor`.
+ * @param {Function} interceptor The function to invoke.
+ * @param {*} [thisArg] The `this` binding of `interceptor`.
+ * @returns {*} Returns the result of `interceptor`.
+ * @example
+ *
+ * _(' abc ')
+ * .chain()
+ * .trim()
+ * .thru(function(value) {
+ * return [value];
+ * })
+ * .value();
+ * // => ['abc']
+ */
+ function thru(value, interceptor, thisArg) {
+ return interceptor.call(thisArg, value);
+ }
+
+ /**
+ * Enables explicit method chaining on the wrapper object.
+ *
+ * @name chain
+ * @memberOf _
+ * @category Chain
+ * @returns {Object} Returns the new `lodash` wrapper instance.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36 },
+ * { 'user': 'fred', 'age': 40 }
+ * ];
+ *
+ * // without explicit chaining
+ * _(users).first();
+ * // => { 'user': 'barney', 'age': 36 }
+ *
+ * // with explicit chaining
+ * _(users).chain()
+ * .first()
+ * .pick('user')
+ * .value();
+ * // => { 'user': 'barney' }
+ */
+ function wrapperChain() {
+ return chain(this);
+ }
+
+ /**
+ * Executes the chained sequence and returns the wrapped result.
+ *
+ * @name commit
+ * @memberOf _
+ * @category Chain
+ * @returns {Object} Returns the new `lodash` wrapper instance.
+ * @example
+ *
+ * var array = [1, 2];
+ * var wrapped = _(array).push(3);
+ *
+ * console.log(array);
+ * // => [1, 2]
+ *
+ * wrapped = wrapped.commit();
+ * console.log(array);
+ * // => [1, 2, 3]
+ *
+ * wrapped.last();
+ * // => 3
+ *
+ * console.log(array);
+ * // => [1, 2, 3]
+ */
+ function wrapperCommit() {
+ return new LodashWrapper(this.value(), this.__chain__);
+ }
+
+ /**
+ * Creates a new array joining a wrapped array with any additional arrays
+ * and/or values.
+ *
+ * @name concat
+ * @memberOf _
+ * @category Chain
+ * @param {...*} [values] The values to concatenate.
+ * @returns {Array} Returns the new concatenated array.
+ * @example
+ *
+ * var array = [1];
+ * var wrapped = _(array).concat(2, [3], [[4]]);
+ *
+ * console.log(wrapped.value());
+ * // => [1, 2, 3, [4]]
+ *
+ * console.log(array);
+ * // => [1]
+ */
+ var wrapperConcat = restParam(function(values) {
+ values = baseFlatten(values);
+ return this.thru(function(array) {
+ return arrayConcat(isArray(array) ? array : [toObject(array)], values);
+ });
+ });
+
+ /**
+ * Creates a clone of the chained sequence planting `value` as the wrapped value.
+ *
+ * @name plant
+ * @memberOf _
+ * @category Chain
+ * @returns {Object} Returns the new `lodash` wrapper instance.
+ * @example
+ *
+ * var array = [1, 2];
+ * var wrapped = _(array).map(function(value) {
+ * return Math.pow(value, 2);
+ * });
+ *
+ * var other = [3, 4];
+ * var otherWrapped = wrapped.plant(other);
+ *
+ * otherWrapped.value();
+ * // => [9, 16]
+ *
+ * wrapped.value();
+ * // => [1, 4]
+ */
+ function wrapperPlant(value) {
+ var result,
+ parent = this;
+
+ while (parent instanceof baseLodash) {
+ var clone = wrapperClone(parent);
+ if (result) {
+ previous.__wrapped__ = clone;
+ } else {
+ result = clone;
+ }
+ var previous = clone;
+ parent = parent.__wrapped__;
+ }
+ previous.__wrapped__ = value;
+ return result;
+ }
+
+ /**
+ * Reverses the wrapped array so the first element becomes the last, the
+ * second element becomes the second to last, and so on.
+ *
+ * **Note:** This method mutates the wrapped array.
+ *
+ * @name reverse
+ * @memberOf _
+ * @category Chain
+ * @returns {Object} Returns the new reversed `lodash` wrapper instance.
+ * @example
+ *
+ * var array = [1, 2, 3];
+ *
+ * _(array).reverse().value()
+ * // => [3, 2, 1]
+ *
+ * console.log(array);
+ * // => [3, 2, 1]
+ */
+ function wrapperReverse() {
+ var value = this.__wrapped__;
+
+ var interceptor = function(value) {
+ return (wrapped && wrapped.__dir__ < 0) ? value : value.reverse();
+ };
+ if (value instanceof LazyWrapper) {
+ var wrapped = value;
+ if (this.__actions__.length) {
+ wrapped = new LazyWrapper(this);
+ }
+ wrapped = wrapped.reverse();
+ wrapped.__actions__.push({ 'func': thru, 'args': [interceptor], 'thisArg': undefined });
+ return new LodashWrapper(wrapped, this.__chain__);
+ }
+ return this.thru(interceptor);
+ }
+
+ /**
+ * Produces the result of coercing the unwrapped value to a string.
+ *
+ * @name toString
+ * @memberOf _
+ * @category Chain
+ * @returns {string} Returns the coerced string value.
+ * @example
+ *
+ * _([1, 2, 3]).toString();
+ * // => '1,2,3'
+ */
+ function wrapperToString() {
+ return (this.value() + '');
+ }
+
+ /**
+ * Executes the chained sequence to extract the unwrapped value.
+ *
+ * @name value
+ * @memberOf _
+ * @alias run, toJSON, valueOf
+ * @category Chain
+ * @returns {*} Returns the resolved unwrapped value.
+ * @example
+ *
+ * _([1, 2, 3]).value();
+ * // => [1, 2, 3]
+ */
+ function wrapperValue() {
+ return baseWrapperValue(this.__wrapped__, this.__actions__);
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates an array of elements corresponding to the given keys, or indexes,
+ * of `collection`. Keys may be specified as individual arguments or as arrays
+ * of keys.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {...(number|number[]|string|string[])} [props] The property names
+ * or indexes of elements to pick, specified individually or in arrays.
+ * @returns {Array} Returns the new array of picked elements.
+ * @example
+ *
+ * _.at(['a', 'b', 'c'], [0, 2]);
+ * // => ['a', 'c']
+ *
+ * _.at(['barney', 'fred', 'pebbles'], 0, 2);
+ * // => ['barney', 'pebbles']
+ */
+ var at = restParam(function(collection, props) {
+ return baseAt(collection, baseFlatten(props));
+ });
+
+ /**
+ * Creates an object composed of keys generated from the results of running
+ * each element of `collection` through `iteratee`. The corresponding value
+ * of each key is the number of times the key was returned by `iteratee`.
+ * The `iteratee` is bound to `thisArg` and invoked with three arguments:
+ * (value, index|key, collection).
+ *
+ * If a property name is provided for `iteratee` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `iteratee` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * _.countBy([4.3, 6.1, 6.4], function(n) {
+ * return Math.floor(n);
+ * });
+ * // => { '4': 1, '6': 2 }
+ *
+ * _.countBy([4.3, 6.1, 6.4], function(n) {
+ * return this.floor(n);
+ * }, Math);
+ * // => { '4': 1, '6': 2 }
+ *
+ * _.countBy(['one', 'two', 'three'], 'length');
+ * // => { '3': 2, '5': 1 }
+ */
+ var countBy = createAggregator(function(result, value, key) {
+ hasOwnProperty.call(result, key) ? ++result[key] : (result[key] = 1);
+ });
+
+ /**
+ * Checks if `predicate` returns truthy for **all** elements of `collection`.
+ * The predicate is bound to `thisArg` and invoked with three arguments:
+ * (value, index|key, collection).
+ *
+ * If a property name is provided for `predicate` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `predicate` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias all
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {boolean} Returns `true` if all elements pass the predicate check,
+ * else `false`.
+ * @example
+ *
+ * _.every([true, 1, null, 'yes'], Boolean);
+ * // => false
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': false },
+ * { 'user': 'fred', 'active': false }
+ * ];
+ *
+ * // using the `_.matches` callback shorthand
+ * _.every(users, { 'user': 'barney', 'active': false });
+ * // => false
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.every(users, 'active', false);
+ * // => true
+ *
+ * // using the `_.property` callback shorthand
+ * _.every(users, 'active');
+ * // => false
+ */
+ function every(collection, predicate, thisArg) {
+ var func = isArray(collection) ? arrayEvery : baseEvery;
+ if (thisArg && isIterateeCall(collection, predicate, thisArg)) {
+ predicate = undefined;
+ }
+ if (typeof predicate != 'function' || thisArg !== undefined) {
+ predicate = getCallback(predicate, thisArg, 3);
+ }
+ return func(collection, predicate);
+ }
+
+ /**
+ * Iterates over elements of `collection`, returning an array of all elements
+ * `predicate` returns truthy for. The predicate is bound to `thisArg` and
+ * invoked with three arguments: (value, index|key, collection).
+ *
+ * If a property name is provided for `predicate` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `predicate` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias select
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Array} Returns the new filtered array.
+ * @example
+ *
+ * _.filter([4, 5, 6], function(n) {
+ * return n % 2 == 0;
+ * });
+ * // => [4, 6]
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36, 'active': true },
+ * { 'user': 'fred', 'age': 40, 'active': false }
+ * ];
+ *
+ * // using the `_.matches` callback shorthand
+ * _.pluck(_.filter(users, { 'age': 36, 'active': true }), 'user');
+ * // => ['barney']
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.pluck(_.filter(users, 'active', false), 'user');
+ * // => ['fred']
+ *
+ * // using the `_.property` callback shorthand
+ * _.pluck(_.filter(users, 'active'), 'user');
+ * // => ['barney']
+ */
+ function filter(collection, predicate, thisArg) {
+ var func = isArray(collection) ? arrayFilter : baseFilter;
+ predicate = getCallback(predicate, thisArg, 3);
+ return func(collection, predicate);
+ }
+
+ /**
+ * Iterates over elements of `collection`, returning the first element
+ * `predicate` returns truthy for. The predicate is bound to `thisArg` and
+ * invoked with three arguments: (value, index|key, collection).
+ *
+ * If a property name is provided for `predicate` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `predicate` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias detect
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to search.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {*} Returns the matched element, else `undefined`.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36, 'active': true },
+ * { 'user': 'fred', 'age': 40, 'active': false },
+ * { 'user': 'pebbles', 'age': 1, 'active': true }
+ * ];
+ *
+ * _.result(_.find(users, function(chr) {
+ * return chr.age < 40;
+ * }), 'user');
+ * // => 'barney'
+ *
+ * // using the `_.matches` callback shorthand
+ * _.result(_.find(users, { 'age': 1, 'active': true }), 'user');
+ * // => 'pebbles'
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.result(_.find(users, 'active', false), 'user');
+ * // => 'fred'
+ *
+ * // using the `_.property` callback shorthand
+ * _.result(_.find(users, 'active'), 'user');
+ * // => 'barney'
+ */
+ var find = createFind(baseEach);
+
+ /**
+ * This method is like `_.find` except that it iterates over elements of
+ * `collection` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to search.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {*} Returns the matched element, else `undefined`.
+ * @example
+ *
+ * _.findLast([1, 2, 3, 4], function(n) {
+ * return n % 2 == 1;
+ * });
+ * // => 3
+ */
+ var findLast = createFind(baseEachRight, true);
+
+ /**
+ * Performs a deep comparison between each element in `collection` and the
+ * source object, returning the first element that has equivalent property
+ * values.
+ *
+ * **Note:** This method supports comparing arrays, booleans, `Date` objects,
+ * numbers, `Object` objects, regexes, and strings. Objects are compared by
+ * their own, not inherited, enumerable properties. For comparing a single
+ * own or inherited property value see `_.matchesProperty`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to search.
+ * @param {Object} source The object of property values to match.
+ * @returns {*} Returns the matched element, else `undefined`.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36, 'active': true },
+ * { 'user': 'fred', 'age': 40, 'active': false }
+ * ];
+ *
+ * _.result(_.findWhere(users, { 'age': 36, 'active': true }), 'user');
+ * // => 'barney'
+ *
+ * _.result(_.findWhere(users, { 'age': 40, 'active': false }), 'user');
+ * // => 'fred'
+ */
+ function findWhere(collection, source) {
+ return find(collection, baseMatches(source));
+ }
+
+ /**
+ * Iterates over elements of `collection` invoking `iteratee` for each element.
+ * The `iteratee` is bound to `thisArg` and invoked with three arguments:
+ * (value, index|key, collection). Iteratee functions may exit iteration early
+ * by explicitly returning `false`.
+ *
+ * **Note:** As with other "Collections" methods, objects with a "length" property
+ * are iterated like arrays. To avoid this behavior `_.forIn` or `_.forOwn`
+ * may be used for object iteration.
+ *
+ * @static
+ * @memberOf _
+ * @alias each
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Array|Object|string} Returns `collection`.
+ * @example
+ *
+ * _([1, 2]).forEach(function(n) {
+ * console.log(n);
+ * }).value();
+ * // => logs each value from left to right and returns the array
+ *
+ * _.forEach({ 'a': 1, 'b': 2 }, function(n, key) {
+ * console.log(n, key);
+ * });
+ * // => logs each value-key pair and returns the object (iteration order is not guaranteed)
+ */
+ var forEach = createForEach(arrayEach, baseEach);
+
+ /**
+ * This method is like `_.forEach` except that it iterates over elements of
+ * `collection` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @alias eachRight
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Array|Object|string} Returns `collection`.
+ * @example
+ *
+ * _([1, 2]).forEachRight(function(n) {
+ * console.log(n);
+ * }).value();
+ * // => logs each value from right to left and returns the array
+ */
+ var forEachRight = createForEach(arrayEachRight, baseEachRight);
+
+ /**
+ * Creates an object composed of keys generated from the results of running
+ * each element of `collection` through `iteratee`. The corresponding value
+ * of each key is an array of the elements responsible for generating the key.
+ * The `iteratee` is bound to `thisArg` and invoked with three arguments:
+ * (value, index|key, collection).
+ *
+ * If a property name is provided for `iteratee` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `iteratee` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * _.groupBy([4.2, 6.1, 6.4], function(n) {
+ * return Math.floor(n);
+ * });
+ * // => { '4': [4.2], '6': [6.1, 6.4] }
+ *
+ * _.groupBy([4.2, 6.1, 6.4], function(n) {
+ * return this.floor(n);
+ * }, Math);
+ * // => { '4': [4.2], '6': [6.1, 6.4] }
+ *
+ * // using the `_.property` callback shorthand
+ * _.groupBy(['one', 'two', 'three'], 'length');
+ * // => { '3': ['one', 'two'], '5': ['three'] }
+ */
+ var groupBy = createAggregator(function(result, value, key) {
+ if (hasOwnProperty.call(result, key)) {
+ result[key].push(value);
+ } else {
+ result[key] = [value];
+ }
+ });
+
+ /**
+ * Checks if `value` is in `collection` using
+ * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * for equality comparisons. If `fromIndex` is negative, it is used as the offset
+ * from the end of `collection`.
+ *
+ * @static
+ * @memberOf _
+ * @alias contains, include
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to search.
+ * @param {*} target The value to search for.
+ * @param {number} [fromIndex=0] The index to search from.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.reduce`.
+ * @returns {boolean} Returns `true` if a matching element is found, else `false`.
+ * @example
+ *
+ * _.includes([1, 2, 3], 1);
+ * // => true
+ *
+ * _.includes([1, 2, 3], 1, 2);
+ * // => false
+ *
+ * _.includes({ 'user': 'fred', 'age': 40 }, 'fred');
+ * // => true
+ *
+ * _.includes('pebbles', 'eb');
+ * // => true
+ */
+ function includes(collection, target, fromIndex, guard) {
+ var length = collection ? getLength(collection) : 0;
+ if (!isLength(length)) {
+ collection = values(collection);
+ length = collection.length;
+ }
+ if (typeof fromIndex != 'number' || (guard && isIterateeCall(target, fromIndex, guard))) {
+ fromIndex = 0;
+ } else {
+ fromIndex = fromIndex < 0 ? nativeMax(length + fromIndex, 0) : (fromIndex || 0);
+ }
+ return (typeof collection == 'string' || !isArray(collection) && isString(collection))
+ ? (fromIndex <= length && collection.indexOf(target, fromIndex) > -1)
+ : (!!length && getIndexOf(collection, target, fromIndex) > -1);
+ }
+
+ /**
+ * Creates an object composed of keys generated from the results of running
+ * each element of `collection` through `iteratee`. The corresponding value
+ * of each key is the last element responsible for generating the key. The
+ * iteratee function is bound to `thisArg` and invoked with three arguments:
+ * (value, index|key, collection).
+ *
+ * If a property name is provided for `iteratee` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `iteratee` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * var keyData = [
+ * { 'dir': 'left', 'code': 97 },
+ * { 'dir': 'right', 'code': 100 }
+ * ];
+ *
+ * _.indexBy(keyData, 'dir');
+ * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
+ *
+ * _.indexBy(keyData, function(object) {
+ * return String.fromCharCode(object.code);
+ * });
+ * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
+ *
+ * _.indexBy(keyData, function(object) {
+ * return this.fromCharCode(object.code);
+ * }, String);
+ * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
+ */
+ var indexBy = createAggregator(function(result, value, key) {
+ result[key] = value;
+ });
+
+ /**
+ * Invokes the method at `path` of each element in `collection`, returning
+ * an array of the results of each invoked method. Any additional arguments
+ * are provided to each invoked method. If `methodName` is a function it is
+ * invoked for, and `this` bound to, each element in `collection`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Array|Function|string} path The path of the method to invoke or
+ * the function invoked per iteration.
+ * @param {...*} [args] The arguments to invoke the method with.
+ * @returns {Array} Returns the array of results.
+ * @example
+ *
+ * _.invoke([[5, 1, 7], [3, 2, 1]], 'sort');
+ * // => [[1, 5, 7], [1, 2, 3]]
+ *
+ * _.invoke([123, 456], String.prototype.split, '');
+ * // => [['1', '2', '3'], ['4', '5', '6']]
+ */
+ var invoke = restParam(function(collection, path, args) {
+ var index = -1,
+ isFunc = typeof path == 'function',
+ isProp = isKey(path),
+ result = isArrayLike(collection) ? Array(collection.length) : [];
+
+ baseEach(collection, function(value) {
+ var func = isFunc ? path : ((isProp && value != null) ? value[path] : undefined);
+ result[++index] = func ? func.apply(value, args) : invokePath(value, path, args);
+ });
+ return result;
+ });
+
+ /**
+ * Creates an array of values by running each element in `collection` through
+ * `iteratee`. The `iteratee` is bound to `thisArg` and invoked with three
+ * arguments: (value, index|key, collection).
+ *
+ * If a property name is provided for `iteratee` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `iteratee` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * Many lodash methods are guarded to work as iteratees for methods like
+ * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.
+ *
+ * The guarded methods are:
+ * `ary`, `callback`, `chunk`, `clone`, `create`, `curry`, `curryRight`,
+ * `drop`, `dropRight`, `every`, `fill`, `flatten`, `invert`, `max`, `min`,
+ * `parseInt`, `slice`, `sortBy`, `take`, `takeRight`, `template`, `trim`,
+ * `trimLeft`, `trimRight`, `trunc`, `random`, `range`, `sample`, `some`,
+ * `sum`, `uniq`, and `words`
+ *
+ * @static
+ * @memberOf _
+ * @alias collect
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Array} Returns the new mapped array.
+ * @example
+ *
+ * function timesThree(n) {
+ * return n * 3;
+ * }
+ *
+ * _.map([1, 2], timesThree);
+ * // => [3, 6]
+ *
+ * _.map({ 'a': 1, 'b': 2 }, timesThree);
+ * // => [3, 6] (iteration order is not guaranteed)
+ *
+ * var users = [
+ * { 'user': 'barney' },
+ * { 'user': 'fred' }
+ * ];
+ *
+ * // using the `_.property` callback shorthand
+ * _.map(users, 'user');
+ * // => ['barney', 'fred']
+ */
+ function map(collection, iteratee, thisArg) {
+ var func = isArray(collection) ? arrayMap : baseMap;
+ iteratee = getCallback(iteratee, thisArg, 3);
+ return func(collection, iteratee);
+ }
+
+ /**
+ * Creates an array of elements split into two groups, the first of which
+ * contains elements `predicate` returns truthy for, while the second of which
+ * contains elements `predicate` returns falsey for. The predicate is bound
+ * to `thisArg` and invoked with three arguments: (value, index|key, collection).
+ *
+ * If a property name is provided for `predicate` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `predicate` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Array} Returns the array of grouped elements.
+ * @example
+ *
+ * _.partition([1, 2, 3], function(n) {
+ * return n % 2;
+ * });
+ * // => [[1, 3], [2]]
+ *
+ * _.partition([1.2, 2.3, 3.4], function(n) {
+ * return this.floor(n) % 2;
+ * }, Math);
+ * // => [[1.2, 3.4], [2.3]]
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36, 'active': false },
+ * { 'user': 'fred', 'age': 40, 'active': true },
+ * { 'user': 'pebbles', 'age': 1, 'active': false }
+ * ];
+ *
+ * var mapper = function(array) {
+ * return _.pluck(array, 'user');
+ * };
+ *
+ * // using the `_.matches` callback shorthand
+ * _.map(_.partition(users, { 'age': 1, 'active': false }), mapper);
+ * // => [['pebbles'], ['barney', 'fred']]
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.map(_.partition(users, 'active', false), mapper);
+ * // => [['barney', 'pebbles'], ['fred']]
+ *
+ * // using the `_.property` callback shorthand
+ * _.map(_.partition(users, 'active'), mapper);
+ * // => [['fred'], ['barney', 'pebbles']]
+ */
+ var partition = createAggregator(function(result, value, key) {
+ result[key ? 0 : 1].push(value);
+ }, function() { return [[], []]; });
+
+ /**
+ * Gets the property value of `path` from all elements in `collection`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Array|string} path The path of the property to pluck.
+ * @returns {Array} Returns the property values.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36 },
+ * { 'user': 'fred', 'age': 40 }
+ * ];
+ *
+ * _.pluck(users, 'user');
+ * // => ['barney', 'fred']
+ *
+ * var userIndex = _.indexBy(users, 'user');
+ * _.pluck(userIndex, 'age');
+ * // => [36, 40] (iteration order is not guaranteed)
+ */
+ function pluck(collection, path) {
+ return map(collection, property(path));
+ }
+
+ /**
+ * Reduces `collection` to a value which is the accumulated result of running
+ * each element in `collection` through `iteratee`, where each successive
+ * invocation is supplied the return value of the previous. If `accumulator`
+ * is not provided the first element of `collection` is used as the initial
+ * value. The `iteratee` is bound to `thisArg` and invoked with four arguments:
+ * (accumulator, value, index|key, collection).
+ *
+ * Many lodash methods are guarded to work as iteratees for methods like
+ * `_.reduce`, `_.reduceRight`, and `_.transform`.
+ *
+ * The guarded methods are:
+ * `assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `sortByAll`,
+ * and `sortByOrder`
+ *
+ * @static
+ * @memberOf _
+ * @alias foldl, inject
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [accumulator] The initial value.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {*} Returns the accumulated value.
+ * @example
+ *
+ * _.reduce([1, 2], function(total, n) {
+ * return total + n;
+ * });
+ * // => 3
+ *
+ * _.reduce({ 'a': 1, 'b': 2 }, function(result, n, key) {
+ * result[key] = n * 3;
+ * return result;
+ * }, {});
+ * // => { 'a': 3, 'b': 6 } (iteration order is not guaranteed)
+ */
+ var reduce = createReduce(arrayReduce, baseEach);
+
+ /**
+ * This method is like `_.reduce` except that it iterates over elements of
+ * `collection` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @alias foldr
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [accumulator] The initial value.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {*} Returns the accumulated value.
+ * @example
+ *
+ * var array = [[0, 1], [2, 3], [4, 5]];
+ *
+ * _.reduceRight(array, function(flattened, other) {
+ * return flattened.concat(other);
+ * }, []);
+ * // => [4, 5, 2, 3, 0, 1]
+ */
+ var reduceRight = createReduce(arrayReduceRight, baseEachRight);
+
+ /**
+ * The opposite of `_.filter`; this method returns the elements of `collection`
+ * that `predicate` does **not** return truthy for.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Array} Returns the new filtered array.
+ * @example
+ *
+ * _.reject([1, 2, 3, 4], function(n) {
+ * return n % 2 == 0;
+ * });
+ * // => [1, 3]
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36, 'active': false },
+ * { 'user': 'fred', 'age': 40, 'active': true }
+ * ];
+ *
+ * // using the `_.matches` callback shorthand
+ * _.pluck(_.reject(users, { 'age': 40, 'active': true }), 'user');
+ * // => ['barney']
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.pluck(_.reject(users, 'active', false), 'user');
+ * // => ['fred']
+ *
+ * // using the `_.property` callback shorthand
+ * _.pluck(_.reject(users, 'active'), 'user');
+ * // => ['barney']
+ */
+ function reject(collection, predicate, thisArg) {
+ var func = isArray(collection) ? arrayFilter : baseFilter;
+ predicate = getCallback(predicate, thisArg, 3);
+ return func(collection, function(value, index, collection) {
+ return !predicate(value, index, collection);
+ });
+ }
+
+ /**
+ * Gets a random element or `n` random elements from a collection.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to sample.
+ * @param {number} [n] The number of elements to sample.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {*} Returns the random sample(s).
+ * @example
+ *
+ * _.sample([1, 2, 3, 4]);
+ * // => 2
+ *
+ * _.sample([1, 2, 3, 4], 2);
+ * // => [3, 1]
+ */
+ function sample(collection, n, guard) {
+ if (guard ? isIterateeCall(collection, n, guard) : n == null) {
+ collection = toIterable(collection);
+ var length = collection.length;
+ return length > 0 ? collection[baseRandom(0, length - 1)] : undefined;
+ }
+ var index = -1,
+ result = toArray(collection),
+ length = result.length,
+ lastIndex = length - 1;
+
+ n = nativeMin(n < 0 ? 0 : (+n || 0), length);
+ while (++index < n) {
+ var rand = baseRandom(index, lastIndex),
+ value = result[rand];
+
+ result[rand] = result[index];
+ result[index] = value;
+ }
+ result.length = n;
+ return result;
+ }
+
+ /**
+ * Creates an array of shuffled values, using a version of the
+ * [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle).
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to shuffle.
+ * @returns {Array} Returns the new shuffled array.
+ * @example
+ *
+ * _.shuffle([1, 2, 3, 4]);
+ * // => [4, 1, 3, 2]
+ */
+ function shuffle(collection) {
+ return sample(collection, POSITIVE_INFINITY);
+ }
+
+ /**
+ * Gets the size of `collection` by returning its length for array-like
+ * values or the number of own enumerable properties for objects.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to inspect.
+ * @returns {number} Returns the size of `collection`.
+ * @example
+ *
+ * _.size([1, 2, 3]);
+ * // => 3
+ *
+ * _.size({ 'a': 1, 'b': 2 });
+ * // => 2
+ *
+ * _.size('pebbles');
+ * // => 7
+ */
+ function size(collection) {
+ var length = collection ? getLength(collection) : 0;
+ return isLength(length) ? length : keys(collection).length;
+ }
+
+ /**
+ * Checks if `predicate` returns truthy for **any** element of `collection`.
+ * The function returns as soon as it finds a passing value and does not iterate
+ * over the entire collection. The predicate is bound to `thisArg` and invoked
+ * with three arguments: (value, index|key, collection).
+ *
+ * If a property name is provided for `predicate` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `predicate` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias any
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {boolean} Returns `true` if any element passes the predicate check,
+ * else `false`.
+ * @example
+ *
+ * _.some([null, 0, 'yes', false], Boolean);
+ * // => true
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': true },
+ * { 'user': 'fred', 'active': false }
+ * ];
+ *
+ * // using the `_.matches` callback shorthand
+ * _.some(users, { 'user': 'barney', 'active': false });
+ * // => false
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.some(users, 'active', false);
+ * // => true
+ *
+ * // using the `_.property` callback shorthand
+ * _.some(users, 'active');
+ * // => true
+ */
+ function some(collection, predicate, thisArg) {
+ var func = isArray(collection) ? arraySome : baseSome;
+ if (thisArg && isIterateeCall(collection, predicate, thisArg)) {
+ predicate = undefined;
+ }
+ if (typeof predicate != 'function' || thisArg !== undefined) {
+ predicate = getCallback(predicate, thisArg, 3);
+ }
+ return func(collection, predicate);
+ }
+
+ /**
+ * Creates an array of elements, sorted in ascending order by the results of
+ * running each element in a collection through `iteratee`. This method performs
+ * a stable sort, that is, it preserves the original sort order of equal elements.
+ * The `iteratee` is bound to `thisArg` and invoked with three arguments:
+ * (value, index|key, collection).
+ *
+ * If a property name is provided for `iteratee` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `iteratee` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Array} Returns the new sorted array.
+ * @example
+ *
+ * _.sortBy([1, 2, 3], function(n) {
+ * return Math.sin(n);
+ * });
+ * // => [3, 1, 2]
+ *
+ * _.sortBy([1, 2, 3], function(n) {
+ * return this.sin(n);
+ * }, Math);
+ * // => [3, 1, 2]
+ *
+ * var users = [
+ * { 'user': 'fred' },
+ * { 'user': 'pebbles' },
+ * { 'user': 'barney' }
+ * ];
+ *
+ * // using the `_.property` callback shorthand
+ * _.pluck(_.sortBy(users, 'user'), 'user');
+ * // => ['barney', 'fred', 'pebbles']
+ */
+ function sortBy(collection, iteratee, thisArg) {
+ if (collection == null) {
+ return [];
+ }
+ if (thisArg && isIterateeCall(collection, iteratee, thisArg)) {
+ iteratee = undefined;
+ }
+ var index = -1;
+ iteratee = getCallback(iteratee, thisArg, 3);
+
+ var result = baseMap(collection, function(value, key, collection) {
+ return { 'criteria': iteratee(value, key, collection), 'index': ++index, 'value': value };
+ });
+ return baseSortBy(result, compareAscending);
+ }
+
+ /**
+ * This method is like `_.sortBy` except that it can sort by multiple iteratees
+ * or property names.
+ *
+ * If a property name is provided for an iteratee the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for an iteratee the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {...(Function|Function[]|Object|Object[]|string|string[])} iteratees
+ * The iteratees to sort by, specified as individual values or arrays of values.
+ * @returns {Array} Returns the new sorted array.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'fred', 'age': 48 },
+ * { 'user': 'barney', 'age': 36 },
+ * { 'user': 'fred', 'age': 42 },
+ * { 'user': 'barney', 'age': 34 }
+ * ];
+ *
+ * _.map(_.sortByAll(users, ['user', 'age']), _.values);
+ * // => [['barney', 34], ['barney', 36], ['fred', 42], ['fred', 48]]
+ *
+ * _.map(_.sortByAll(users, 'user', function(chr) {
+ * return Math.floor(chr.age / 10);
+ * }), _.values);
+ * // => [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 42]]
+ */
+ var sortByAll = restParam(function(collection, iteratees) {
+ if (collection == null) {
+ return [];
+ }
+ var guard = iteratees[2];
+ if (guard && isIterateeCall(iteratees[0], iteratees[1], guard)) {
+ iteratees.length = 1;
+ }
+ return baseSortByOrder(collection, baseFlatten(iteratees), []);
+ });
+
+ /**
+ * This method is like `_.sortByAll` except that it allows specifying the
+ * sort orders of the iteratees to sort by. If `orders` is unspecified, all
+ * values are sorted in ascending order. Otherwise, a value is sorted in
+ * ascending order if its corresponding order is "asc", and descending if "desc".
+ *
+ * If a property name is provided for an iteratee the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for an iteratee the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by.
+ * @param {boolean[]} [orders] The sort orders of `iteratees`.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.reduce`.
+ * @returns {Array} Returns the new sorted array.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'fred', 'age': 48 },
+ * { 'user': 'barney', 'age': 34 },
+ * { 'user': 'fred', 'age': 42 },
+ * { 'user': 'barney', 'age': 36 }
+ * ];
+ *
+ * // sort by `user` in ascending order and by `age` in descending order
+ * _.map(_.sortByOrder(users, ['user', 'age'], ['asc', 'desc']), _.values);
+ * // => [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 42]]
+ */
+ function sortByOrder(collection, iteratees, orders, guard) {
+ if (collection == null) {
+ return [];
+ }
+ if (guard && isIterateeCall(iteratees, orders, guard)) {
+ orders = undefined;
+ }
+ if (!isArray(iteratees)) {
+ iteratees = iteratees == null ? [] : [iteratees];
+ }
+ if (!isArray(orders)) {
+ orders = orders == null ? [] : [orders];
+ }
+ return baseSortByOrder(collection, iteratees, orders);
+ }
+
+ /**
+ * Performs a deep comparison between each element in `collection` and the
+ * source object, returning an array of all elements that have equivalent
+ * property values.
+ *
+ * **Note:** This method supports comparing arrays, booleans, `Date` objects,
+ * numbers, `Object` objects, regexes, and strings. Objects are compared by
+ * their own, not inherited, enumerable properties. For comparing a single
+ * own or inherited property value see `_.matchesProperty`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to search.
+ * @param {Object} source The object of property values to match.
+ * @returns {Array} Returns the new filtered array.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36, 'active': false, 'pets': ['hoppy'] },
+ * { 'user': 'fred', 'age': 40, 'active': true, 'pets': ['baby puss', 'dino'] }
+ * ];
+ *
+ * _.pluck(_.where(users, { 'age': 36, 'active': false }), 'user');
+ * // => ['barney']
+ *
+ * _.pluck(_.where(users, { 'pets': ['dino'] }), 'user');
+ * // => ['fred']
+ */
+ function where(collection, source) {
+ return filter(collection, baseMatches(source));
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Gets the number of milliseconds that have elapsed since the Unix epoch
+ * (1 January 1970 00:00:00 UTC).
+ *
+ * @static
+ * @memberOf _
+ * @category Date
+ * @example
+ *
+ * _.defer(function(stamp) {
+ * console.log(_.now() - stamp);
+ * }, _.now());
+ * // => logs the number of milliseconds it took for the deferred function to be invoked
+ */
+ var now = nativeNow || function() {
+ return new Date().getTime();
+ };
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * The opposite of `_.before`; this method creates a function that invokes
+ * `func` once it is called `n` or more times.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {number} n The number of calls before `func` is invoked.
+ * @param {Function} func The function to restrict.
+ * @returns {Function} Returns the new restricted function.
+ * @example
+ *
+ * var saves = ['profile', 'settings'];
+ *
+ * var done = _.after(saves.length, function() {
+ * console.log('done saving!');
+ * });
+ *
+ * _.forEach(saves, function(type) {
+ * asyncSave({ 'type': type, 'complete': done });
+ * });
+ * // => logs 'done saving!' after the two async saves have completed
+ */
+ function after(n, func) {
+ if (typeof func != 'function') {
+ if (typeof n == 'function') {
+ var temp = n;
+ n = func;
+ func = temp;
+ } else {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ }
+ n = nativeIsFinite(n = +n) ? n : 0;
+ return function() {
+ if (--n < 1) {
+ return func.apply(this, arguments);
+ }
+ };
+ }
+
+ /**
+ * Creates a function that accepts up to `n` arguments ignoring any
+ * additional arguments.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to cap arguments for.
+ * @param {number} [n=func.length] The arity cap.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * _.map(['6', '8', '10'], _.ary(parseInt, 1));
+ * // => [6, 8, 10]
+ */
+ function ary(func, n, guard) {
+ if (guard && isIterateeCall(func, n, guard)) {
+ n = undefined;
+ }
+ n = (func && n == null) ? func.length : nativeMax(+n || 0, 0);
+ return createWrapper(func, ARY_FLAG, undefined, undefined, undefined, undefined, n);
+ }
+
+ /**
+ * Creates a function that invokes `func`, with the `this` binding and arguments
+ * of the created function, while it is called less than `n` times. Subsequent
+ * calls to the created function return the result of the last `func` invocation.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {number} n The number of calls at which `func` is no longer invoked.
+ * @param {Function} func The function to restrict.
+ * @returns {Function} Returns the new restricted function.
+ * @example
+ *
+ * jQuery('#add').on('click', _.before(5, addContactToList));
+ * // => allows adding up to 4 contacts to the list
+ */
+ function before(n, func) {
+ var result;
+ if (typeof func != 'function') {
+ if (typeof n == 'function') {
+ var temp = n;
+ n = func;
+ func = temp;
+ } else {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ }
+ return function() {
+ if (--n > 0) {
+ result = func.apply(this, arguments);
+ }
+ if (n <= 1) {
+ func = undefined;
+ }
+ return result;
+ };
+ }
+
+ /**
+ * Creates a function that invokes `func` with the `this` binding of `thisArg`
+ * and prepends any additional `_.bind` arguments to those provided to the
+ * bound function.
+ *
+ * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
+ * may be used as a placeholder for partially applied arguments.
+ *
+ * **Note:** Unlike native `Function#bind` this method does not set the "length"
+ * property of bound functions.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to bind.
+ * @param {*} thisArg The `this` binding of `func`.
+ * @param {...*} [partials] The arguments to be partially applied.
+ * @returns {Function} Returns the new bound function.
+ * @example
+ *
+ * var greet = function(greeting, punctuation) {
+ * return greeting + ' ' + this.user + punctuation;
+ * };
+ *
+ * var object = { 'user': 'fred' };
+ *
+ * var bound = _.bind(greet, object, 'hi');
+ * bound('!');
+ * // => 'hi fred!'
+ *
+ * // using placeholders
+ * var bound = _.bind(greet, object, _, '!');
+ * bound('hi');
+ * // => 'hi fred!'
+ */
+ var bind = restParam(function(func, thisArg, partials) {
+ var bitmask = BIND_FLAG;
+ if (partials.length) {
+ var holders = replaceHolders(partials, bind.placeholder);
+ bitmask |= PARTIAL_FLAG;
+ }
+ return createWrapper(func, bitmask, thisArg, partials, holders);
+ });
+
+ /**
+ * Binds methods of an object to the object itself, overwriting the existing
+ * method. Method names may be specified as individual arguments or as arrays
+ * of method names. If no method names are provided all enumerable function
+ * properties, own and inherited, of `object` are bound.
+ *
+ * **Note:** This method does not set the "length" property of bound functions.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Object} object The object to bind and assign the bound methods to.
+ * @param {...(string|string[])} [methodNames] The object method names to bind,
+ * specified as individual method names or arrays of method names.
+ * @returns {Object} Returns `object`.
+ * @example
+ *
+ * var view = {
+ * 'label': 'docs',
+ * 'onClick': function() {
+ * console.log('clicked ' + this.label);
+ * }
+ * };
+ *
+ * _.bindAll(view);
+ * jQuery('#docs').on('click', view.onClick);
+ * // => logs 'clicked docs' when the element is clicked
+ */
+ var bindAll = restParam(function(object, methodNames) {
+ methodNames = methodNames.length ? baseFlatten(methodNames) : functions(object);
+
+ var index = -1,
+ length = methodNames.length;
+
+ while (++index < length) {
+ var key = methodNames[index];
+ object[key] = createWrapper(object[key], BIND_FLAG, object);
+ }
+ return object;
+ });
+
+ /**
+ * Creates a function that invokes the method at `object[key]` and prepends
+ * any additional `_.bindKey` arguments to those provided to the bound function.
+ *
+ * This method differs from `_.bind` by allowing bound functions to reference
+ * methods that may be redefined or don't yet exist.
+ * See [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definition-pattern)
+ * for more details.
+ *
+ * The `_.bindKey.placeholder` value, which defaults to `_` in monolithic
+ * builds, may be used as a placeholder for partially applied arguments.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Object} object The object the method belongs to.
+ * @param {string} key The key of the method.
+ * @param {...*} [partials] The arguments to be partially applied.
+ * @returns {Function} Returns the new bound function.
+ * @example
+ *
+ * var object = {
+ * 'user': 'fred',
+ * 'greet': function(greeting, punctuation) {
+ * return greeting + ' ' + this.user + punctuation;
+ * }
+ * };
+ *
+ * var bound = _.bindKey(object, 'greet', 'hi');
+ * bound('!');
+ * // => 'hi fred!'
+ *
+ * object.greet = function(greeting, punctuation) {
+ * return greeting + 'ya ' + this.user + punctuation;
+ * };
+ *
+ * bound('!');
+ * // => 'hiya fred!'
+ *
+ * // using placeholders
+ * var bound = _.bindKey(object, 'greet', _, '!');
+ * bound('hi');
+ * // => 'hiya fred!'
+ */
+ var bindKey = restParam(function(object, key, partials) {
+ var bitmask = BIND_FLAG | BIND_KEY_FLAG;
+ if (partials.length) {
+ var holders = replaceHolders(partials, bindKey.placeholder);
+ bitmask |= PARTIAL_FLAG;
+ }
+ return createWrapper(key, bitmask, object, partials, holders);
+ });
+
+ /**
+ * Creates a function that accepts one or more arguments of `func` that when
+ * called either invokes `func` returning its result, if all `func` arguments
+ * have been provided, or returns a function that accepts one or more of the
+ * remaining `func` arguments, and so on. The arity of `func` may be specified
+ * if `func.length` is not sufficient.
+ *
+ * The `_.curry.placeholder` value, which defaults to `_` in monolithic builds,
+ * may be used as a placeholder for provided arguments.
+ *
+ * **Note:** This method does not set the "length" property of curried functions.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to curry.
+ * @param {number} [arity=func.length] The arity of `func`.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Function} Returns the new curried function.
+ * @example
+ *
+ * var abc = function(a, b, c) {
+ * return [a, b, c];
+ * };
+ *
+ * var curried = _.curry(abc);
+ *
+ * curried(1)(2)(3);
+ * // => [1, 2, 3]
+ *
+ * curried(1, 2)(3);
+ * // => [1, 2, 3]
+ *
+ * curried(1, 2, 3);
+ * // => [1, 2, 3]
+ *
+ * // using placeholders
+ * curried(1)(_, 3)(2);
+ * // => [1, 2, 3]
+ */
+ var curry = createCurry(CURRY_FLAG);
+
+ /**
+ * This method is like `_.curry` except that arguments are applied to `func`
+ * in the manner of `_.partialRight` instead of `_.partial`.
+ *
+ * The `_.curryRight.placeholder` value, which defaults to `_` in monolithic
+ * builds, may be used as a placeholder for provided arguments.
+ *
+ * **Note:** This method does not set the "length" property of curried functions.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to curry.
+ * @param {number} [arity=func.length] The arity of `func`.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Function} Returns the new curried function.
+ * @example
+ *
+ * var abc = function(a, b, c) {
+ * return [a, b, c];
+ * };
+ *
+ * var curried = _.curryRight(abc);
+ *
+ * curried(3)(2)(1);
+ * // => [1, 2, 3]
+ *
+ * curried(2, 3)(1);
+ * // => [1, 2, 3]
+ *
+ * curried(1, 2, 3);
+ * // => [1, 2, 3]
+ *
+ * // using placeholders
+ * curried(3)(1, _)(2);
+ * // => [1, 2, 3]
+ */
+ var curryRight = createCurry(CURRY_RIGHT_FLAG);
+
+ /**
+ * Creates a debounced function that delays invoking `func` until after `wait`
+ * milliseconds have elapsed since the last time the debounced function was
+ * invoked. The debounced function comes with a `cancel` method to cancel
+ * delayed invocations. Provide an options object to indicate that `func`
+ * should be invoked on the leading and/or trailing edge of the `wait` timeout.
+ * Subsequent calls to the debounced function return the result of the last
+ * `func` invocation.
+ *
+ * **Note:** If `leading` and `trailing` options are `true`, `func` is invoked
+ * on the trailing edge of the timeout only if the the debounced function is
+ * invoked more than once during the `wait` timeout.
+ *
+ * See [David Corbacho's article](http://drupalmotion.com/article/debounce-and-throttle-visual-explanation)
+ * for details over the differences between `_.debounce` and `_.throttle`.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to debounce.
+ * @param {number} [wait=0] The number of milliseconds to delay.
+ * @param {Object} [options] The options object.
+ * @param {boolean} [options.leading=false] Specify invoking on the leading
+ * edge of the timeout.
+ * @param {number} [options.maxWait] The maximum time `func` is allowed to be
+ * delayed before it is invoked.
+ * @param {boolean} [options.trailing=true] Specify invoking on the trailing
+ * edge of the timeout.
+ * @returns {Function} Returns the new debounced function.
+ * @example
+ *
+ * // avoid costly calculations while the window size is in flux
+ * jQuery(window).on('resize', _.debounce(calculateLayout, 150));
+ *
+ * // invoke `sendMail` when the click event is fired, debouncing subsequent calls
+ * jQuery('#postbox').on('click', _.debounce(sendMail, 300, {
+ * 'leading': true,
+ * 'trailing': false
+ * }));
+ *
+ * // ensure `batchLog` is invoked once after 1 second of debounced calls
+ * var source = new EventSource('/stream');
+ * jQuery(source).on('message', _.debounce(batchLog, 250, {
+ * 'maxWait': 1000
+ * }));
+ *
+ * // cancel a debounced call
+ * var todoChanges = _.debounce(batchLog, 1000);
+ * Object.observe(models.todo, todoChanges);
+ *
+ * Object.observe(models, function(changes) {
+ * if (_.find(changes, { 'user': 'todo', 'type': 'delete'})) {
+ * todoChanges.cancel();
+ * }
+ * }, ['delete']);
+ *
+ * // ...at some point `models.todo` is changed
+ * models.todo.completed = true;
+ *
+ * // ...before 1 second has passed `models.todo` is deleted
+ * // which cancels the debounced `todoChanges` call
+ * delete models.todo;
+ */
+ function debounce(func, wait, options) {
+ var args,
+ maxTimeoutId,
+ result,
+ stamp,
+ thisArg,
+ timeoutId,
+ trailingCall,
+ lastCalled = 0,
+ maxWait = false,
+ trailing = true;
+
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ wait = wait < 0 ? 0 : (+wait || 0);
+ if (options === true) {
+ var leading = true;
+ trailing = false;
+ } else if (isObject(options)) {
+ leading = !!options.leading;
+ maxWait = 'maxWait' in options && nativeMax(+options.maxWait || 0, wait);
+ trailing = 'trailing' in options ? !!options.trailing : trailing;
+ }
+
+ function cancel() {
+ if (timeoutId) {
+ clearTimeout(timeoutId);
+ }
+ if (maxTimeoutId) {
+ clearTimeout(maxTimeoutId);
+ }
+ lastCalled = 0;
+ maxTimeoutId = timeoutId = trailingCall = undefined;
+ }
+
+ function complete(isCalled, id) {
+ if (id) {
+ clearTimeout(id);
+ }
+ maxTimeoutId = timeoutId = trailingCall = undefined;
+ if (isCalled) {
+ lastCalled = now();
+ result = func.apply(thisArg, args);
+ if (!timeoutId && !maxTimeoutId) {
+ args = thisArg = undefined;
+ }
+ }
+ }
+
+ function delayed() {
+ var remaining = wait - (now() - stamp);
+ if (remaining <= 0 || remaining > wait) {
+ complete(trailingCall, maxTimeoutId);
+ } else {
+ timeoutId = setTimeout(delayed, remaining);
+ }
+ }
+
+ function maxDelayed() {
+ complete(trailing, timeoutId);
+ }
+
+ function debounced() {
+ args = arguments;
+ stamp = now();
+ thisArg = this;
+ trailingCall = trailing && (timeoutId || !leading);
+
+ if (maxWait === false) {
+ var leadingCall = leading && !timeoutId;
+ } else {
+ if (!maxTimeoutId && !leading) {
+ lastCalled = stamp;
+ }
+ var remaining = maxWait - (stamp - lastCalled),
+ isCalled = remaining <= 0 || remaining > maxWait;
+
+ if (isCalled) {
+ if (maxTimeoutId) {
+ maxTimeoutId = clearTimeout(maxTimeoutId);
+ }
+ lastCalled = stamp;
+ result = func.apply(thisArg, args);
+ }
+ else if (!maxTimeoutId) {
+ maxTimeoutId = setTimeout(maxDelayed, remaining);
+ }
+ }
+ if (isCalled && timeoutId) {
+ timeoutId = clearTimeout(timeoutId);
+ }
+ else if (!timeoutId && wait !== maxWait) {
+ timeoutId = setTimeout(delayed, wait);
+ }
+ if (leadingCall) {
+ isCalled = true;
+ result = func.apply(thisArg, args);
+ }
+ if (isCalled && !timeoutId && !maxTimeoutId) {
+ args = thisArg = undefined;
+ }
+ return result;
+ }
+ debounced.cancel = cancel;
+ return debounced;
+ }
+
+ /**
+ * Defers invoking the `func` until the current call stack has cleared. Any
+ * additional arguments are provided to `func` when it is invoked.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to defer.
+ * @param {...*} [args] The arguments to invoke the function with.
+ * @returns {number} Returns the timer id.
+ * @example
+ *
+ * _.defer(function(text) {
+ * console.log(text);
+ * }, 'deferred');
+ * // logs 'deferred' after one or more milliseconds
+ */
+ var defer = restParam(function(func, args) {
+ return baseDelay(func, 1, args);
+ });
+
+ /**
+ * Invokes `func` after `wait` milliseconds. Any additional arguments are
+ * provided to `func` when it is invoked.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to delay.
+ * @param {number} wait The number of milliseconds to delay invocation.
+ * @param {...*} [args] The arguments to invoke the function with.
+ * @returns {number} Returns the timer id.
+ * @example
+ *
+ * _.delay(function(text) {
+ * console.log(text);
+ * }, 1000, 'later');
+ * // => logs 'later' after one second
+ */
+ var delay = restParam(function(func, wait, args) {
+ return baseDelay(func, wait, args);
+ });
+
+ /**
+ * Creates a function that returns the result of invoking the provided
+ * functions with the `this` binding of the created function, where each
+ * successive invocation is supplied the return value of the previous.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {...Function} [funcs] Functions to invoke.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * function square(n) {
+ * return n * n;
+ * }
+ *
+ * var addSquare = _.flow(_.add, square);
+ * addSquare(1, 2);
+ * // => 9
+ */
+ var flow = createFlow();
+
+ /**
+ * This method is like `_.flow` except that it creates a function that
+ * invokes the provided functions from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @alias backflow, compose
+ * @category Function
+ * @param {...Function} [funcs] Functions to invoke.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * function square(n) {
+ * return n * n;
+ * }
+ *
+ * var addSquare = _.flowRight(square, _.add);
+ * addSquare(1, 2);
+ * // => 9
+ */
+ var flowRight = createFlow(true);
+
+ /**
+ * Creates a function that memoizes the result of `func`. If `resolver` is
+ * provided it determines the cache key for storing the result based on the
+ * arguments provided to the memoized function. By default, the first argument
+ * provided to the memoized function is coerced to a string and used as the
+ * cache key. The `func` is invoked with the `this` binding of the memoized
+ * function.
+ *
+ * **Note:** The cache is exposed as the `cache` property on the memoized
+ * function. Its creation may be customized by replacing the `_.memoize.Cache`
+ * constructor with one whose instances implement the [`Map`](http://ecma-international.org/ecma-262/6.0/#sec-properties-of-the-map-prototype-object)
+ * method interface of `get`, `has`, and `set`.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to have its output memoized.
+ * @param {Function} [resolver] The function to resolve the cache key.
+ * @returns {Function} Returns the new memoizing function.
+ * @example
+ *
+ * var upperCase = _.memoize(function(string) {
+ * return string.toUpperCase();
+ * });
+ *
+ * upperCase('fred');
+ * // => 'FRED'
+ *
+ * // modifying the result cache
+ * upperCase.cache.set('fred', 'BARNEY');
+ * upperCase('fred');
+ * // => 'BARNEY'
+ *
+ * // replacing `_.memoize.Cache`
+ * var object = { 'user': 'fred' };
+ * var other = { 'user': 'barney' };
+ * var identity = _.memoize(_.identity);
+ *
+ * identity(object);
+ * // => { 'user': 'fred' }
+ * identity(other);
+ * // => { 'user': 'fred' }
+ *
+ * _.memoize.Cache = WeakMap;
+ * var identity = _.memoize(_.identity);
+ *
+ * identity(object);
+ * // => { 'user': 'fred' }
+ * identity(other);
+ * // => { 'user': 'barney' }
+ */
+ function memoize(func, resolver) {
+ if (typeof func != 'function' || (resolver && typeof resolver != 'function')) {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ var memoized = function() {
+ var args = arguments,
+ key = resolver ? resolver.apply(this, args) : args[0],
+ cache = memoized.cache;
+
+ if (cache.has(key)) {
+ return cache.get(key);
+ }
+ var result = func.apply(this, args);
+ memoized.cache = cache.set(key, result);
+ return result;
+ };
+ memoized.cache = new memoize.Cache;
+ return memoized;
+ }
+
+ /**
+ * Creates a function that runs each argument through a corresponding
+ * transform function.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to wrap.
+ * @param {...(Function|Function[])} [transforms] The functions to transform
+ * arguments, specified as individual functions or arrays of functions.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * function doubled(n) {
+ * return n * 2;
+ * }
+ *
+ * function square(n) {
+ * return n * n;
+ * }
+ *
+ * var modded = _.modArgs(function(x, y) {
+ * return [x, y];
+ * }, square, doubled);
+ *
+ * modded(1, 2);
+ * // => [1, 4]
+ *
+ * modded(5, 10);
+ * // => [25, 20]
+ */
+ var modArgs = restParam(function(func, transforms) {
+ transforms = baseFlatten(transforms);
+ if (typeof func != 'function' || !arrayEvery(transforms, baseIsFunction)) {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ var length = transforms.length;
+ return restParam(function(args) {
+ var index = nativeMin(args.length, length);
+ while (index--) {
+ args[index] = transforms[index](args[index]);
+ }
+ return func.apply(this, args);
+ });
+ });
+
+ /**
+ * Creates a function that negates the result of the predicate `func`. The
+ * `func` predicate is invoked with the `this` binding and arguments of the
+ * created function.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} predicate The predicate to negate.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * function isEven(n) {
+ * return n % 2 == 0;
+ * }
+ *
+ * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));
+ * // => [1, 3, 5]
+ */
+ function negate(predicate) {
+ if (typeof predicate != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ return function() {
+ return !predicate.apply(this, arguments);
+ };
+ }
+
+ /**
+ * Creates a function that is restricted to invoking `func` once. Repeat calls
+ * to the function return the value of the first call. The `func` is invoked
+ * with the `this` binding and arguments of the created function.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to restrict.
+ * @returns {Function} Returns the new restricted function.
+ * @example
+ *
+ * var initialize = _.once(createApplication);
+ * initialize();
+ * initialize();
+ * // `initialize` invokes `createApplication` once
+ */
+ function once(func) {
+ return before(2, func);
+ }
+
+ /**
+ * Creates a function that invokes `func` with `partial` arguments prepended
+ * to those provided to the new function. This method is like `_.bind` except
+ * it does **not** alter the `this` binding.
+ *
+ * The `_.partial.placeholder` value, which defaults to `_` in monolithic
+ * builds, may be used as a placeholder for partially applied arguments.
+ *
+ * **Note:** This method does not set the "length" property of partially
+ * applied functions.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to partially apply arguments to.
+ * @param {...*} [partials] The arguments to be partially applied.
+ * @returns {Function} Returns the new partially applied function.
+ * @example
+ *
+ * var greet = function(greeting, name) {
+ * return greeting + ' ' + name;
+ * };
+ *
+ * var sayHelloTo = _.partial(greet, 'hello');
+ * sayHelloTo('fred');
+ * // => 'hello fred'
+ *
+ * // using placeholders
+ * var greetFred = _.partial(greet, _, 'fred');
+ * greetFred('hi');
+ * // => 'hi fred'
+ */
+ var partial = createPartial(PARTIAL_FLAG);
+
+ /**
+ * This method is like `_.partial` except that partially applied arguments
+ * are appended to those provided to the new function.
+ *
+ * The `_.partialRight.placeholder` value, which defaults to `_` in monolithic
+ * builds, may be used as a placeholder for partially applied arguments.
+ *
+ * **Note:** This method does not set the "length" property of partially
+ * applied functions.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to partially apply arguments to.
+ * @param {...*} [partials] The arguments to be partially applied.
+ * @returns {Function} Returns the new partially applied function.
+ * @example
+ *
+ * var greet = function(greeting, name) {
+ * return greeting + ' ' + name;
+ * };
+ *
+ * var greetFred = _.partialRight(greet, 'fred');
+ * greetFred('hi');
+ * // => 'hi fred'
+ *
+ * // using placeholders
+ * var sayHelloTo = _.partialRight(greet, 'hello', _);
+ * sayHelloTo('fred');
+ * // => 'hello fred'
+ */
+ var partialRight = createPartial(PARTIAL_RIGHT_FLAG);
+
+ /**
+ * Creates a function that invokes `func` with arguments arranged according
+ * to the specified indexes where the argument value at the first index is
+ * provided as the first argument, the argument value at the second index is
+ * provided as the second argument, and so on.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to rearrange arguments for.
+ * @param {...(number|number[])} indexes The arranged argument indexes,
+ * specified as individual indexes or arrays of indexes.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var rearged = _.rearg(function(a, b, c) {
+ * return [a, b, c];
+ * }, 2, 0, 1);
+ *
+ * rearged('b', 'c', 'a')
+ * // => ['a', 'b', 'c']
+ *
+ * var map = _.rearg(_.map, [1, 0]);
+ * map(function(n) {
+ * return n * 3;
+ * }, [1, 2, 3]);
+ * // => [3, 6, 9]
+ */
+ var rearg = restParam(function(func, indexes) {
+ return createWrapper(func, REARG_FLAG, undefined, undefined, undefined, baseFlatten(indexes));
+ });
+
+ /**
+ * Creates a function that invokes `func` with the `this` binding of the
+ * created function and arguments from `start` and beyond provided as an array.
+ *
+ * **Note:** This method is based on the [rest parameter](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters).
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to apply a rest parameter to.
+ * @param {number} [start=func.length-1] The start position of the rest parameter.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var say = _.restParam(function(what, names) {
+ * return what + ' ' + _.initial(names).join(', ') +
+ * (_.size(names) > 1 ? ', & ' : '') + _.last(names);
+ * });
+ *
+ * say('hello', 'fred', 'barney', 'pebbles');
+ * // => 'hello fred, barney, & pebbles'
+ */
+ function restParam(func, start) {
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ start = nativeMax(start === undefined ? (func.length - 1) : (+start || 0), 0);
+ return function() {
+ var args = arguments,
+ index = -1,
+ length = nativeMax(args.length - start, 0),
+ rest = Array(length);
+
+ while (++index < length) {
+ rest[index] = args[start + index];
+ }
+ switch (start) {
+ case 0: return func.call(this, rest);
+ case 1: return func.call(this, args[0], rest);
+ case 2: return func.call(this, args[0], args[1], rest);
+ }
+ var otherArgs = Array(start + 1);
+ index = -1;
+ while (++index < start) {
+ otherArgs[index] = args[index];
+ }
+ otherArgs[start] = rest;
+ return func.apply(this, otherArgs);
+ };
+ }
+
+ /**
+ * Creates a function that invokes `func` with the `this` binding of the created
+ * function and an array of arguments much like [`Function#apply`](https://es5.github.io/#x15.3.4.3).
+ *
+ * **Note:** This method is based on the [spread operator](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_operator).
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to spread arguments over.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var say = _.spread(function(who, what) {
+ * return who + ' says ' + what;
+ * });
+ *
+ * say(['fred', 'hello']);
+ * // => 'fred says hello'
+ *
+ * // with a Promise
+ * var numbers = Promise.all([
+ * Promise.resolve(40),
+ * Promise.resolve(36)
+ * ]);
+ *
+ * numbers.then(_.spread(function(x, y) {
+ * return x + y;
+ * }));
+ * // => a Promise of 76
+ */
+ function spread(func) {
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ return function(array) {
+ return func.apply(this, array);
+ };
+ }
+
+ /**
+ * Creates a throttled function that only invokes `func` at most once per
+ * every `wait` milliseconds. The throttled function comes with a `cancel`
+ * method to cancel delayed invocations. Provide an options object to indicate
+ * that `func` should be invoked on the leading and/or trailing edge of the
+ * `wait` timeout. Subsequent calls to the throttled function return the
+ * result of the last `func` call.
+ *
+ * **Note:** If `leading` and `trailing` options are `true`, `func` is invoked
+ * on the trailing edge of the timeout only if the the throttled function is
+ * invoked more than once during the `wait` timeout.
+ *
+ * See [David Corbacho's article](http://drupalmotion.com/article/debounce-and-throttle-visual-explanation)
+ * for details over the differences between `_.throttle` and `_.debounce`.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to throttle.
+ * @param {number} [wait=0] The number of milliseconds to throttle invocations to.
+ * @param {Object} [options] The options object.
+ * @param {boolean} [options.leading=true] Specify invoking on the leading
+ * edge of the timeout.
+ * @param {boolean} [options.trailing=true] Specify invoking on the trailing
+ * edge of the timeout.
+ * @returns {Function} Returns the new throttled function.
+ * @example
+ *
+ * // avoid excessively updating the position while scrolling
+ * jQuery(window).on('scroll', _.throttle(updatePosition, 100));
+ *
+ * // invoke `renewToken` when the click event is fired, but not more than once every 5 minutes
+ * jQuery('.interactive').on('click', _.throttle(renewToken, 300000, {
+ * 'trailing': false
+ * }));
+ *
+ * // cancel a trailing throttled call
+ * jQuery(window).on('popstate', throttled.cancel);
+ */
+ function throttle(func, wait, options) {
+ var leading = true,
+ trailing = true;
+
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ if (options === false) {
+ leading = false;
+ } else if (isObject(options)) {
+ leading = 'leading' in options ? !!options.leading : leading;
+ trailing = 'trailing' in options ? !!options.trailing : trailing;
+ }
+ return debounce(func, wait, { 'leading': leading, 'maxWait': +wait, 'trailing': trailing });
+ }
+
+ /**
+ * Creates a function that provides `value` to the wrapper function as its
+ * first argument. Any additional arguments provided to the function are
+ * appended to those provided to the wrapper function. The wrapper is invoked
+ * with the `this` binding of the created function.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {*} value The value to wrap.
+ * @param {Function} wrapper The wrapper function.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var p = _.wrap(_.escape, function(func, text) {
+ * return '<p>' + func(text) + '</p>';
+ * });
+ *
+ * p('fred, barney, & pebbles');
+ * // => '<p>fred, barney, &amp; pebbles</p>'
+ */
+ function wrap(value, wrapper) {
+ wrapper = wrapper == null ? identity : wrapper;
+ return createWrapper(wrapper, PARTIAL_FLAG, undefined, [value], []);
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates a clone of `value`. If `isDeep` is `true` nested objects are cloned,
+ * otherwise they are assigned by reference. If `customizer` is provided it is
+ * invoked to produce the cloned values. If `customizer` returns `undefined`
+ * cloning is handled by the method instead. The `customizer` is bound to
+ * `thisArg` and invoked with two argument; (value [, index|key, object]).
+ *
+ * **Note:** This method is loosely based on the
+ * [structured clone algorithm](http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm).
+ * The enumerable properties of `arguments` objects and objects created by
+ * constructors other than `Object` are cloned to plain `Object` objects. An
+ * empty object is returned for uncloneable values such as functions, DOM nodes,
+ * Maps, Sets, and WeakMaps.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to clone.
+ * @param {boolean} [isDeep] Specify a deep clone.
+ * @param {Function} [customizer] The function to customize cloning values.
+ * @param {*} [thisArg] The `this` binding of `customizer`.
+ * @returns {*} Returns the cloned value.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney' },
+ * { 'user': 'fred' }
+ * ];
+ *
+ * var shallow = _.clone(users);
+ * shallow[0] === users[0];
+ * // => true
+ *
+ * var deep = _.clone(users, true);
+ * deep[0] === users[0];
+ * // => false
+ *
+ * // using a customizer callback
+ * var el = _.clone(document.body, function(value) {
+ * if (_.isElement(value)) {
+ * return value.cloneNode(false);
+ * }
+ * });
+ *
+ * el === document.body
+ * // => false
+ * el.nodeName
+ * // => BODY
+ * el.childNodes.length;
+ * // => 0
+ */
+ function clone(value, isDeep, customizer, thisArg) {
+ if (isDeep && typeof isDeep != 'boolean' && isIterateeCall(value, isDeep, customizer)) {
+ isDeep = false;
+ }
+ else if (typeof isDeep == 'function') {
+ thisArg = customizer;
+ customizer = isDeep;
+ isDeep = false;
+ }
+ return typeof customizer == 'function'
+ ? baseClone(value, isDeep, bindCallback(customizer, thisArg, 1))
+ : baseClone(value, isDeep);
+ }
+
+ /**
+ * Creates a deep clone of `value`. If `customizer` is provided it is invoked
+ * to produce the cloned values. If `customizer` returns `undefined` cloning
+ * is handled by the method instead. The `customizer` is bound to `thisArg`
+ * and invoked with two argument; (value [, index|key, object]).
+ *
+ * **Note:** This method is loosely based on the
+ * [structured clone algorithm](http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm).
+ * The enumerable properties of `arguments` objects and objects created by
+ * constructors other than `Object` are cloned to plain `Object` objects. An
+ * empty object is returned for uncloneable values such as functions, DOM nodes,
+ * Maps, Sets, and WeakMaps.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to deep clone.
+ * @param {Function} [customizer] The function to customize cloning values.
+ * @param {*} [thisArg] The `this` binding of `customizer`.
+ * @returns {*} Returns the deep cloned value.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney' },
+ * { 'user': 'fred' }
+ * ];
+ *
+ * var deep = _.cloneDeep(users);
+ * deep[0] === users[0];
+ * // => false
+ *
+ * // using a customizer callback
+ * var el = _.cloneDeep(document.body, function(value) {
+ * if (_.isElement(value)) {
+ * return value.cloneNode(true);
+ * }
+ * });
+ *
+ * el === document.body
+ * // => false
+ * el.nodeName
+ * // => BODY
+ * el.childNodes.length;
+ * // => 20
+ */
+ function cloneDeep(value, customizer, thisArg) {
+ return typeof customizer == 'function'
+ ? baseClone(value, true, bindCallback(customizer, thisArg, 1))
+ : baseClone(value, true);
+ }
+
+ /**
+ * Checks if `value` is greater than `other`.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {boolean} Returns `true` if `value` is greater than `other`, else `false`.
+ * @example
+ *
+ * _.gt(3, 1);
+ * // => true
+ *
+ * _.gt(3, 3);
+ * // => false
+ *
+ * _.gt(1, 3);
+ * // => false
+ */
+ function gt(value, other) {
+ return value > other;
+ }
+
+ /**
+ * Checks if `value` is greater than or equal to `other`.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {boolean} Returns `true` if `value` is greater than or equal to `other`, else `false`.
+ * @example
+ *
+ * _.gte(3, 1);
+ * // => true
+ *
+ * _.gte(3, 3);
+ * // => true
+ *
+ * _.gte(1, 3);
+ * // => false
+ */
+ function gte(value, other) {
+ return value >= other;
+ }
+
+ /**
+ * Checks if `value` is classified as an `arguments` object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isArguments(function() { return arguments; }());
+ * // => true
+ *
+ * _.isArguments([1, 2, 3]);
+ * // => false
+ */
+ function isArguments(value) {
+ return isObjectLike(value) && isArrayLike(value) &&
+ hasOwnProperty.call(value, 'callee') && !propertyIsEnumerable.call(value, 'callee');
+ }
+
+ /**
+ * Checks if `value` is classified as an `Array` object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isArray([1, 2, 3]);
+ * // => true
+ *
+ * _.isArray(function() { return arguments; }());
+ * // => false
+ */
+ var isArray = nativeIsArray || function(value) {
+ return isObjectLike(value) && isLength(value.length) && objToString.call(value) == arrayTag;
+ };
+
+ /**
+ * Checks if `value` is classified as a boolean primitive or object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isBoolean(false);
+ * // => true
+ *
+ * _.isBoolean(null);
+ * // => false
+ */
+ function isBoolean(value) {
+ return value === true || value === false || (isObjectLike(value) && objToString.call(value) == boolTag);
+ }
+
+ /**
+ * Checks if `value` is classified as a `Date` object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isDate(new Date);
+ * // => true
+ *
+ * _.isDate('Mon April 23 2012');
+ * // => false
+ */
+ function isDate(value) {
+ return isObjectLike(value) && objToString.call(value) == dateTag;
+ }
+
+ /**
+ * Checks if `value` is a DOM element.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`.
+ * @example
+ *
+ * _.isElement(document.body);
+ * // => true
+ *
+ * _.isElement('<body>');
+ * // => false
+ */
+ function isElement(value) {
+ return !!value && value.nodeType === 1 && isObjectLike(value) && !isPlainObject(value);
+ }
+
+ /**
+ * Checks if `value` is empty. A value is considered empty unless it is an
+ * `arguments` object, array, string, or jQuery-like collection with a length
+ * greater than `0` or an object with own enumerable properties.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {Array|Object|string} value The value to inspect.
+ * @returns {boolean} Returns `true` if `value` is empty, else `false`.
+ * @example
+ *
+ * _.isEmpty(null);
+ * // => true
+ *
+ * _.isEmpty(true);
+ * // => true
+ *
+ * _.isEmpty(1);
+ * // => true
+ *
+ * _.isEmpty([1, 2, 3]);
+ * // => false
+ *
+ * _.isEmpty({ 'a': 1 });
+ * // => false
+ */
+ function isEmpty(value) {
+ if (value == null) {
+ return true;
+ }
+ if (isArrayLike(value) && (isArray(value) || isString(value) || isArguments(value) ||
+ (isObjectLike(value) && isFunction(value.splice)))) {
+ return !value.length;
+ }
+ return !keys(value).length;
+ }
+
+ /**
+ * Performs a deep comparison between two values to determine if they are
+ * equivalent. If `customizer` is provided it is invoked to compare values.
+ * If `customizer` returns `undefined` comparisons are handled by the method
+ * instead. The `customizer` is bound to `thisArg` and invoked with three
+ * arguments: (value, other [, index|key]).
+ *
+ * **Note:** This method supports comparing arrays, booleans, `Date` objects,
+ * numbers, `Object` objects, regexes, and strings. Objects are compared by
+ * their own, not inherited, enumerable properties. Functions and DOM nodes
+ * are **not** supported. Provide a customizer function to extend support
+ * for comparing other values.
+ *
+ * @static
+ * @memberOf _
+ * @alias eq
+ * @category Lang
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @param {Function} [customizer] The function to customize value comparisons.
+ * @param {*} [thisArg] The `this` binding of `customizer`.
+ * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
+ * @example
+ *
+ * var object = { 'user': 'fred' };
+ * var other = { 'user': 'fred' };
+ *
+ * object == other;
+ * // => false
+ *
+ * _.isEqual(object, other);
+ * // => true
+ *
+ * // using a customizer callback
+ * var array = ['hello', 'goodbye'];
+ * var other = ['hi', 'goodbye'];
+ *
+ * _.isEqual(array, other, function(value, other) {
+ * if (_.every([value, other], RegExp.prototype.test, /^h(?:i|ello)$/)) {
+ * return true;
+ * }
+ * });
+ * // => true
+ */
+ function isEqual(value, other, customizer, thisArg) {
+ customizer = typeof customizer == 'function' ? bindCallback(customizer, thisArg, 3) : undefined;
+ var result = customizer ? customizer(value, other) : undefined;
+ return result === undefined ? baseIsEqual(value, other, customizer) : !!result;
+ }
+
+ /**
+ * Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`,
+ * `SyntaxError`, `TypeError`, or `URIError` object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is an error object, else `false`.
+ * @example
+ *
+ * _.isError(new Error);
+ * // => true
+ *
+ * _.isError(Error);
+ * // => false
+ */
+ function isError(value) {
+ return isObjectLike(value) && typeof value.message == 'string' && objToString.call(value) == errorTag;
+ }
+
+ /**
+ * Checks if `value` is a finite primitive number.
+ *
+ * **Note:** This method is based on [`Number.isFinite`](http://ecma-international.org/ecma-262/6.0/#sec-number.isfinite).
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a finite number, else `false`.
+ * @example
+ *
+ * _.isFinite(10);
+ * // => true
+ *
+ * _.isFinite('10');
+ * // => false
+ *
+ * _.isFinite(true);
+ * // => false
+ *
+ * _.isFinite(Object(10));
+ * // => false
+ *
+ * _.isFinite(Infinity);
+ * // => false
+ */
+ function isFinite(value) {
+ return typeof value == 'number' && nativeIsFinite(value);
+ }
+
+ /**
+ * Checks if `value` is classified as a `Function` object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isFunction(_);
+ * // => true
+ *
+ * _.isFunction(/abc/);
+ * // => false
+ */
+ function isFunction(value) {
+ // The use of `Object#toString` avoids issues with the `typeof` operator
+ // in older versions of Chrome and Safari which return 'function' for regexes
+ // and Safari 8 equivalents which return 'object' for typed array constructors.
+ return isObject(value) && objToString.call(value) == funcTag;
+ }
+
+ /**
+ * Checks if `value` is the [language type](https://es5.github.io/#x8) of `Object`.
+ * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is an object, else `false`.
+ * @example
+ *
+ * _.isObject({});
+ * // => true
+ *
+ * _.isObject([1, 2, 3]);
+ * // => true
+ *
+ * _.isObject(1);
+ * // => false
+ */
+ function isObject(value) {
+ // Avoid a V8 JIT bug in Chrome 19-20.
+ // See https://code.google.com/p/v8/issues/detail?id=2291 for more details.
+ var type = typeof value;
+ return !!value && (type == 'object' || type == 'function');
+ }
+
+ /**
+ * Performs a deep comparison between `object` and `source` to determine if
+ * `object` contains equivalent property values. If `customizer` is provided
+ * it is invoked to compare values. If `customizer` returns `undefined`
+ * comparisons are handled by the method instead. The `customizer` is bound
+ * to `thisArg` and invoked with three arguments: (value, other, index|key).
+ *
+ * **Note:** This method supports comparing properties of arrays, booleans,
+ * `Date` objects, numbers, `Object` objects, regexes, and strings. Functions
+ * and DOM nodes are **not** supported. Provide a customizer function to extend
+ * support for comparing other values.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {Object} object The object to inspect.
+ * @param {Object} source The object of property values to match.
+ * @param {Function} [customizer] The function to customize value comparisons.
+ * @param {*} [thisArg] The `this` binding of `customizer`.
+ * @returns {boolean} Returns `true` if `object` is a match, else `false`.
+ * @example
+ *
+ * var object = { 'user': 'fred', 'age': 40 };
+ *
+ * _.isMatch(object, { 'age': 40 });
+ * // => true
+ *
+ * _.isMatch(object, { 'age': 36 });
+ * // => false
+ *
+ * // using a customizer callback
+ * var object = { 'greeting': 'hello' };
+ * var source = { 'greeting': 'hi' };
+ *
+ * _.isMatch(object, source, function(value, other) {
+ * return _.every([value, other], RegExp.prototype.test, /^h(?:i|ello)$/) || undefined;
+ * });
+ * // => true
+ */
+ function isMatch(object, source, customizer, thisArg) {
+ customizer = typeof customizer == 'function' ? bindCallback(customizer, thisArg, 3) : undefined;
+ return baseIsMatch(object, getMatchData(source), customizer);
+ }
+
+ /**
+ * Checks if `value` is `NaN`.
+ *
+ * **Note:** This method is not the same as [`isNaN`](https://es5.github.io/#x15.1.2.4)
+ * which returns `true` for `undefined` and other non-numeric values.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
+ * @example
+ *
+ * _.isNaN(NaN);
+ * // => true
+ *
+ * _.isNaN(new Number(NaN));
+ * // => true
+ *
+ * isNaN(undefined);
+ * // => true
+ *
+ * _.isNaN(undefined);
+ * // => false
+ */
+ function isNaN(value) {
+ // An `NaN` primitive is the only value that is not equal to itself.
+ // Perform the `toStringTag` check first to avoid errors with some host objects in IE.
+ return isNumber(value) && value != +value;
+ }
+
+ /**
+ * Checks if `value` is a native function.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a native function, else `false`.
+ * @example
+ *
+ * _.isNative(Array.prototype.push);
+ * // => true
+ *
+ * _.isNative(_);
+ * // => false
+ */
+ function isNative(value) {
+ if (value == null) {
+ return false;
+ }
+ if (isFunction(value)) {
+ return reIsNative.test(fnToString.call(value));
+ }
+ return isObjectLike(value) && reIsHostCtor.test(value);
+ }
+
+ /**
+ * Checks if `value` is `null`.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is `null`, else `false`.
+ * @example
+ *
+ * _.isNull(null);
+ * // => true
+ *
+ * _.isNull(void 0);
+ * // => false
+ */
+ function isNull(value) {
+ return value === null;
+ }
+
+ /**
+ * Checks if `value` is classified as a `Number` primitive or object.
+ *
+ * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are classified
+ * as numbers, use the `_.isFinite` method.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isNumber(8.4);
+ * // => true
+ *
+ * _.isNumber(NaN);
+ * // => true
+ *
+ * _.isNumber('8.4');
+ * // => false
+ */
+ function isNumber(value) {
+ return typeof value == 'number' || (isObjectLike(value) && objToString.call(value) == numberTag);
+ }
+
+ /**
+ * Checks if `value` is a plain object, that is, an object created by the
+ * `Object` constructor or one with a `[[Prototype]]` of `null`.
+ *
+ * **Note:** This method assumes objects created by the `Object` constructor
+ * have no inherited enumerable properties.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * }
+ *
+ * _.isPlainObject(new Foo);
+ * // => false
+ *
+ * _.isPlainObject([1, 2, 3]);
+ * // => false
+ *
+ * _.isPlainObject({ 'x': 0, 'y': 0 });
+ * // => true
+ *
+ * _.isPlainObject(Object.create(null));
+ * // => true
+ */
+ function isPlainObject(value) {
+ var Ctor;
+
+ // Exit early for non `Object` objects.
+ if (!(isObjectLike(value) && objToString.call(value) == objectTag && !isArguments(value)) ||
+ (!hasOwnProperty.call(value, 'constructor') && (Ctor = value.constructor, typeof Ctor == 'function' && !(Ctor instanceof Ctor)))) {
+ return false;
+ }
+ // IE < 9 iterates inherited properties before own properties. If the first
+ // iterated property is an object's own property then there are no inherited
+ // enumerable properties.
+ var result;
+ // In most environments an object's own properties are iterated before
+ // its inherited properties. If the last iterated property is an object's
+ // own property then there are no inherited enumerable properties.
+ baseForIn(value, function(subValue, key) {
+ result = key;
+ });
+ return result === undefined || hasOwnProperty.call(value, result);
+ }
+
+ /**
+ * Checks if `value` is classified as a `RegExp` object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isRegExp(/abc/);
+ * // => true
+ *
+ * _.isRegExp('/abc/');
+ * // => false
+ */
+ function isRegExp(value) {
+ return isObject(value) && objToString.call(value) == regexpTag;
+ }
+
+ /**
+ * Checks if `value` is classified as a `String` primitive or object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isString('abc');
+ * // => true
+ *
+ * _.isString(1);
+ * // => false
+ */
+ function isString(value) {
+ return typeof value == 'string' || (isObjectLike(value) && objToString.call(value) == stringTag);
+ }
+
+ /**
+ * Checks if `value` is classified as a typed array.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isTypedArray(new Uint8Array);
+ * // => true
+ *
+ * _.isTypedArray([]);
+ * // => false
+ */
+ function isTypedArray(value) {
+ return isObjectLike(value) && isLength(value.length) && !!typedArrayTags[objToString.call(value)];
+ }
+
+ /**
+ * Checks if `value` is `undefined`.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is `undefined`, else `false`.
+ * @example
+ *
+ * _.isUndefined(void 0);
+ * // => true
+ *
+ * _.isUndefined(null);
+ * // => false
+ */
+ function isUndefined(value) {
+ return value === undefined;
+ }
+
+ /**
+ * Checks if `value` is less than `other`.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {boolean} Returns `true` if `value` is less than `other`, else `false`.
+ * @example
+ *
+ * _.lt(1, 3);
+ * // => true
+ *
+ * _.lt(3, 3);
+ * // => false
+ *
+ * _.lt(3, 1);
+ * // => false
+ */
+ function lt(value, other) {
+ return value < other;
+ }
+
+ /**
+ * Checks if `value` is less than or equal to `other`.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {boolean} Returns `true` if `value` is less than or equal to `other`, else `false`.
+ * @example
+ *
+ * _.lte(1, 3);
+ * // => true
+ *
+ * _.lte(3, 3);
+ * // => true
+ *
+ * _.lte(3, 1);
+ * // => false
+ */
+ function lte(value, other) {
+ return value <= other;
+ }
+
+ /**
+ * Converts `value` to an array.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to convert.
+ * @returns {Array} Returns the converted array.
+ * @example
+ *
+ * (function() {
+ * return _.toArray(arguments).slice(1);
+ * }(1, 2, 3));
+ * // => [2, 3]
+ */
+ function toArray(value) {
+ var length = value ? getLength(value) : 0;
+ if (!isLength(length)) {
+ return values(value);
+ }
+ if (!length) {
+ return [];
+ }
+ return arrayCopy(value);
+ }
+
+ /**
+ * Converts `value` to a plain object flattening inherited enumerable
+ * properties of `value` to own properties of the plain object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to convert.
+ * @returns {Object} Returns the converted plain object.
+ * @example
+ *
+ * function Foo() {
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.assign({ 'a': 1 }, new Foo);
+ * // => { 'a': 1, 'b': 2 }
+ *
+ * _.assign({ 'a': 1 }, _.toPlainObject(new Foo));
+ * // => { 'a': 1, 'b': 2, 'c': 3 }
+ */
+ function toPlainObject(value) {
+ return baseCopy(value, keysIn(value));
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Recursively merges own enumerable properties of the source object(s), that
+ * don't resolve to `undefined` into the destination object. Subsequent sources
+ * overwrite property assignments of previous sources. If `customizer` is
+ * provided it is invoked to produce the merged values of the destination and
+ * source properties. If `customizer` returns `undefined` merging is handled
+ * by the method instead. The `customizer` is bound to `thisArg` and invoked
+ * with five arguments: (objectValue, sourceValue, key, object, source).
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The destination object.
+ * @param {...Object} [sources] The source objects.
+ * @param {Function} [customizer] The function to customize assigned values.
+ * @param {*} [thisArg] The `this` binding of `customizer`.
+ * @returns {Object} Returns `object`.
+ * @example
+ *
+ * var users = {
+ * 'data': [{ 'user': 'barney' }, { 'user': 'fred' }]
+ * };
+ *
+ * var ages = {
+ * 'data': [{ 'age': 36 }, { 'age': 40 }]
+ * };
+ *
+ * _.merge(users, ages);
+ * // => { 'data': [{ 'user': 'barney', 'age': 36 }, { 'user': 'fred', 'age': 40 }] }
+ *
+ * // using a customizer callback
+ * var object = {
+ * 'fruits': ['apple'],
+ * 'vegetables': ['beet']
+ * };
+ *
+ * var other = {
+ * 'fruits': ['banana'],
+ * 'vegetables': ['carrot']
+ * };
+ *
+ * _.merge(object, other, function(a, b) {
+ * if (_.isArray(a)) {
+ * return a.concat(b);
+ * }
+ * });
+ * // => { 'fruits': ['apple', 'banana'], 'vegetables': ['beet', 'carrot'] }
+ */
+ var merge = createAssigner(baseMerge);
+
+ /**
+ * Assigns own enumerable properties of source object(s) to the destination
+ * object. Subsequent sources overwrite property assignments of previous sources.
+ * If `customizer` is provided it is invoked to produce the assigned values.
+ * The `customizer` is bound to `thisArg` and invoked with five arguments:
+ * (objectValue, sourceValue, key, object, source).
+ *
+ * **Note:** This method mutates `object` and is based on
+ * [`Object.assign`](http://ecma-international.org/ecma-262/6.0/#sec-object.assign).
+ *
+ * @static
+ * @memberOf _
+ * @alias extend
+ * @category Object
+ * @param {Object} object The destination object.
+ * @param {...Object} [sources] The source objects.
+ * @param {Function} [customizer] The function to customize assigned values.
+ * @param {*} [thisArg] The `this` binding of `customizer`.
+ * @returns {Object} Returns `object`.
+ * @example
+ *
+ * _.assign({ 'user': 'barney' }, { 'age': 40 }, { 'user': 'fred' });
+ * // => { 'user': 'fred', 'age': 40 }
+ *
+ * // using a customizer callback
+ * var defaults = _.partialRight(_.assign, function(value, other) {
+ * return _.isUndefined(value) ? other : value;
+ * });
+ *
+ * defaults({ 'user': 'barney' }, { 'age': 36 }, { 'user': 'fred' });
+ * // => { 'user': 'barney', 'age': 36 }
+ */
+ var assign = createAssigner(function(object, source, customizer) {
+ return customizer
+ ? assignWith(object, source, customizer)
+ : baseAssign(object, source);
+ });
+
+ /**
+ * Creates an object that inherits from the given `prototype` object. If a
+ * `properties` object is provided its own enumerable properties are assigned
+ * to the created object.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} prototype The object to inherit from.
+ * @param {Object} [properties] The properties to assign to the object.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Object} Returns the new object.
+ * @example
+ *
+ * function Shape() {
+ * this.x = 0;
+ * this.y = 0;
+ * }
+ *
+ * function Circle() {
+ * Shape.call(this);
+ * }
+ *
+ * Circle.prototype = _.create(Shape.prototype, {
+ * 'constructor': Circle
+ * });
+ *
+ * var circle = new Circle;
+ * circle instanceof Circle;
+ * // => true
+ *
+ * circle instanceof Shape;
+ * // => true
+ */
+ function create(prototype, properties, guard) {
+ var result = baseCreate(prototype);
+ if (guard && isIterateeCall(prototype, properties, guard)) {
+ properties = undefined;
+ }
+ return properties ? baseAssign(result, properties) : result;
+ }
+
+ /**
+ * Assigns own enumerable properties of source object(s) to the destination
+ * object for all destination properties that resolve to `undefined`. Once a
+ * property is set, additional values of the same property are ignored.
+ *
+ * **Note:** This method mutates `object`.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The destination object.
+ * @param {...Object} [sources] The source objects.
+ * @returns {Object} Returns `object`.
+ * @example
+ *
+ * _.defaults({ 'user': 'barney' }, { 'age': 36 }, { 'user': 'fred' });
+ * // => { 'user': 'barney', 'age': 36 }
+ */
+ var defaults = createDefaults(assign, assignDefaults);
+
+ /**
+ * This method is like `_.defaults` except that it recursively assigns
+ * default properties.
+ *
+ * **Note:** This method mutates `object`.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The destination object.
+ * @param {...Object} [sources] The source objects.
+ * @returns {Object} Returns `object`.
+ * @example
+ *
+ * _.defaultsDeep({ 'user': { 'name': 'barney' } }, { 'user': { 'name': 'fred', 'age': 36 } });
+ * // => { 'user': { 'name': 'barney', 'age': 36 } }
+ *
+ */
+ var defaultsDeep = createDefaults(merge, mergeDefaults);
+
+ /**
+ * This method is like `_.find` except that it returns the key of the first
+ * element `predicate` returns truthy for instead of the element itself.
+ *
+ * If a property name is provided for `predicate` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `predicate` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to search.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {string|undefined} Returns the key of the matched element, else `undefined`.
+ * @example
+ *
+ * var users = {
+ * 'barney': { 'age': 36, 'active': true },
+ * 'fred': { 'age': 40, 'active': false },
+ * 'pebbles': { 'age': 1, 'active': true }
+ * };
+ *
+ * _.findKey(users, function(chr) {
+ * return chr.age < 40;
+ * });
+ * // => 'barney' (iteration order is not guaranteed)
+ *
+ * // using the `_.matches` callback shorthand
+ * _.findKey(users, { 'age': 1, 'active': true });
+ * // => 'pebbles'
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.findKey(users, 'active', false);
+ * // => 'fred'
+ *
+ * // using the `_.property` callback shorthand
+ * _.findKey(users, 'active');
+ * // => 'barney'
+ */
+ var findKey = createFindKey(baseForOwn);
+
+ /**
+ * This method is like `_.findKey` except that it iterates over elements of
+ * a collection in the opposite order.
+ *
+ * If a property name is provided for `predicate` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `predicate` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to search.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {string|undefined} Returns the key of the matched element, else `undefined`.
+ * @example
+ *
+ * var users = {
+ * 'barney': { 'age': 36, 'active': true },
+ * 'fred': { 'age': 40, 'active': false },
+ * 'pebbles': { 'age': 1, 'active': true }
+ * };
+ *
+ * _.findLastKey(users, function(chr) {
+ * return chr.age < 40;
+ * });
+ * // => returns `pebbles` assuming `_.findKey` returns `barney`
+ *
+ * // using the `_.matches` callback shorthand
+ * _.findLastKey(users, { 'age': 36, 'active': true });
+ * // => 'barney'
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.findLastKey(users, 'active', false);
+ * // => 'fred'
+ *
+ * // using the `_.property` callback shorthand
+ * _.findLastKey(users, 'active');
+ * // => 'pebbles'
+ */
+ var findLastKey = createFindKey(baseForOwnRight);
+
+ /**
+ * Iterates over own and inherited enumerable properties of an object invoking
+ * `iteratee` for each property. The `iteratee` is bound to `thisArg` and invoked
+ * with three arguments: (value, key, object). Iteratee functions may exit
+ * iteration early by explicitly returning `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Object} Returns `object`.
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.forIn(new Foo, function(value, key) {
+ * console.log(key);
+ * });
+ * // => logs 'a', 'b', and 'c' (iteration order is not guaranteed)
+ */
+ var forIn = createForIn(baseFor);
+
+ /**
+ * This method is like `_.forIn` except that it iterates over properties of
+ * `object` in the opposite order.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Object} Returns `object`.
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.forInRight(new Foo, function(value, key) {
+ * console.log(key);
+ * });
+ * // => logs 'c', 'b', and 'a' assuming `_.forIn ` logs 'a', 'b', and 'c'
+ */
+ var forInRight = createForIn(baseForRight);
+
+ /**
+ * Iterates over own enumerable properties of an object invoking `iteratee`
+ * for each property. The `iteratee` is bound to `thisArg` and invoked with
+ * three arguments: (value, key, object). Iteratee functions may exit iteration
+ * early by explicitly returning `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Object} Returns `object`.
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.forOwn(new Foo, function(value, key) {
+ * console.log(key);
+ * });
+ * // => logs 'a' and 'b' (iteration order is not guaranteed)
+ */
+ var forOwn = createForOwn(baseForOwn);
+
+ /**
+ * This method is like `_.forOwn` except that it iterates over properties of
+ * `object` in the opposite order.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Object} Returns `object`.
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.forOwnRight(new Foo, function(value, key) {
+ * console.log(key);
+ * });
+ * // => logs 'b' and 'a' assuming `_.forOwn` logs 'a' and 'b'
+ */
+ var forOwnRight = createForOwn(baseForOwnRight);
+
+ /**
+ * Creates an array of function property names from all enumerable properties,
+ * own and inherited, of `object`.
+ *
+ * @static
+ * @memberOf _
+ * @alias methods
+ * @category Object
+ * @param {Object} object The object to inspect.
+ * @returns {Array} Returns the new array of property names.
+ * @example
+ *
+ * _.functions(_);
+ * // => ['after', 'ary', 'assign', ...]
+ */
+ function functions(object) {
+ return baseFunctions(object, keysIn(object));
+ }
+
+ /**
+ * Gets the property value at `path` of `object`. If the resolved value is
+ * `undefined` the `defaultValue` is used in its place.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path of the property to get.
+ * @param {*} [defaultValue] The value returned if the resolved value is `undefined`.
+ * @returns {*} Returns the resolved value.
+ * @example
+ *
+ * var object = { 'a': [{ 'b': { 'c': 3 } }] };
+ *
+ * _.get(object, 'a[0].b.c');
+ * // => 3
+ *
+ * _.get(object, ['a', '0', 'b', 'c']);
+ * // => 3
+ *
+ * _.get(object, 'a.b.c', 'default');
+ * // => 'default'
+ */
+ function get(object, path, defaultValue) {
+ var result = object == null ? undefined : baseGet(object, toPath(path), path + '');
+ return result === undefined ? defaultValue : result;
+ }
+
+ /**
+ * Checks if `path` is a direct property.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path to check.
+ * @returns {boolean} Returns `true` if `path` is a direct property, else `false`.
+ * @example
+ *
+ * var object = { 'a': { 'b': { 'c': 3 } } };
+ *
+ * _.has(object, 'a');
+ * // => true
+ *
+ * _.has(object, 'a.b.c');
+ * // => true
+ *
+ * _.has(object, ['a', 'b', 'c']);
+ * // => true
+ */
+ function has(object, path) {
+ if (object == null) {
+ return false;
+ }
+ var result = hasOwnProperty.call(object, path);
+ if (!result && !isKey(path)) {
+ path = toPath(path);
+ object = path.length == 1 ? object : baseGet(object, baseSlice(path, 0, -1));
+ if (object == null) {
+ return false;
+ }
+ path = last(path);
+ result = hasOwnProperty.call(object, path);
+ }
+ return result || (isLength(object.length) && isIndex(path, object.length) &&
+ (isArray(object) || isArguments(object)));
+ }
+
+ /**
+ * Creates an object composed of the inverted keys and values of `object`.
+ * If `object` contains duplicate values, subsequent values overwrite property
+ * assignments of previous values unless `multiValue` is `true`.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to invert.
+ * @param {boolean} [multiValue] Allow multiple values per key.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Object} Returns the new inverted object.
+ * @example
+ *
+ * var object = { 'a': 1, 'b': 2, 'c': 1 };
+ *
+ * _.invert(object);
+ * // => { '1': 'c', '2': 'b' }
+ *
+ * // with `multiValue`
+ * _.invert(object, true);
+ * // => { '1': ['a', 'c'], '2': ['b'] }
+ */
+ function invert(object, multiValue, guard) {
+ if (guard && isIterateeCall(object, multiValue, guard)) {
+ multiValue = undefined;
+ }
+ var index = -1,
+ props = keys(object),
+ length = props.length,
+ result = {};
+
+ while (++index < length) {
+ var key = props[index],
+ value = object[key];
+
+ if (multiValue) {
+ if (hasOwnProperty.call(result, value)) {
+ result[value].push(key);
+ } else {
+ result[value] = [key];
+ }
+ }
+ else {
+ result[value] = key;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Creates an array of the own enumerable property names of `object`.
+ *
+ * **Note:** Non-object values are coerced to objects. See the
+ * [ES spec](http://ecma-international.org/ecma-262/6.0/#sec-object.keys)
+ * for more details.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names.
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.keys(new Foo);
+ * // => ['a', 'b'] (iteration order is not guaranteed)
+ *
+ * _.keys('hi');
+ * // => ['0', '1']
+ */
+ var keys = !nativeKeys ? shimKeys : function(object) {
+ var Ctor = object == null ? undefined : object.constructor;
+ if ((typeof Ctor == 'function' && Ctor.prototype === object) ||
+ (typeof object != 'function' && isArrayLike(object))) {
+ return shimKeys(object);
+ }
+ return isObject(object) ? nativeKeys(object) : [];
+ };
+
+ /**
+ * Creates an array of the own and inherited enumerable property names of `object`.
+ *
+ * **Note:** Non-object values are coerced to objects.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names.
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.keysIn(new Foo);
+ * // => ['a', 'b', 'c'] (iteration order is not guaranteed)
+ */
+ function keysIn(object) {
+ if (object == null) {
+ return [];
+ }
+ if (!isObject(object)) {
+ object = Object(object);
+ }
+ var length = object.length;
+ length = (length && isLength(length) &&
+ (isArray(object) || isArguments(object)) && length) || 0;
+
+ var Ctor = object.constructor,
+ index = -1,
+ isProto = typeof Ctor == 'function' && Ctor.prototype === object,
+ result = Array(length),
+ skipIndexes = length > 0;
+
+ while (++index < length) {
+ result[index] = (index + '');
+ }
+ for (var key in object) {
+ if (!(skipIndexes && isIndex(key, length)) &&
+ !(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {
+ result.push(key);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The opposite of `_.mapValues`; this method creates an object with the
+ * same values as `object` and keys generated by running each own enumerable
+ * property of `object` through `iteratee`.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Object} Returns the new mapped object.
+ * @example
+ *
+ * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) {
+ * return key + value;
+ * });
+ * // => { 'a1': 1, 'b2': 2 }
+ */
+ var mapKeys = createObjectMapper(true);
+
+ /**
+ * Creates an object with the same keys as `object` and values generated by
+ * running each own enumerable property of `object` through `iteratee`. The
+ * iteratee function is bound to `thisArg` and invoked with three arguments:
+ * (value, key, object).
+ *
+ * If a property name is provided for `iteratee` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `iteratee` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked
+ * per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Object} Returns the new mapped object.
+ * @example
+ *
+ * _.mapValues({ 'a': 1, 'b': 2 }, function(n) {
+ * return n * 3;
+ * });
+ * // => { 'a': 3, 'b': 6 }
+ *
+ * var users = {
+ * 'fred': { 'user': 'fred', 'age': 40 },
+ * 'pebbles': { 'user': 'pebbles', 'age': 1 }
+ * };
+ *
+ * // using the `_.property` callback shorthand
+ * _.mapValues(users, 'age');
+ * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
+ */
+ var mapValues = createObjectMapper();
+
+ /**
+ * The opposite of `_.pick`; this method creates an object composed of the
+ * own and inherited enumerable properties of `object` that are not omitted.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The source object.
+ * @param {Function|...(string|string[])} [predicate] The function invoked per
+ * iteration or property names to omit, specified as individual property
+ * names or arrays of property names.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Object} Returns the new object.
+ * @example
+ *
+ * var object = { 'user': 'fred', 'age': 40 };
+ *
+ * _.omit(object, 'age');
+ * // => { 'user': 'fred' }
+ *
+ * _.omit(object, _.isNumber);
+ * // => { 'user': 'fred' }
+ */
+ var omit = restParam(function(object, props) {
+ if (object == null) {
+ return {};
+ }
+ if (typeof props[0] != 'function') {
+ var props = arrayMap(baseFlatten(props), String);
+ return pickByArray(object, baseDifference(keysIn(object), props));
+ }
+ var predicate = bindCallback(props[0], props[1], 3);
+ return pickByCallback(object, function(value, key, object) {
+ return !predicate(value, key, object);
+ });
+ });
+
+ /**
+ * Creates a two dimensional array of the key-value pairs for `object`,
+ * e.g. `[[key1, value1], [key2, value2]]`.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the new array of key-value pairs.
+ * @example
+ *
+ * _.pairs({ 'barney': 36, 'fred': 40 });
+ * // => [['barney', 36], ['fred', 40]] (iteration order is not guaranteed)
+ */
+ function pairs(object) {
+ object = toObject(object);
+
+ var index = -1,
+ props = keys(object),
+ length = props.length,
+ result = Array(length);
+
+ while (++index < length) {
+ var key = props[index];
+ result[index] = [key, object[key]];
+ }
+ return result;
+ }
+
+ /**
+ * Creates an object composed of the picked `object` properties. Property
+ * names may be specified as individual arguments or as arrays of property
+ * names. If `predicate` is provided it is invoked for each property of `object`
+ * picking the properties `predicate` returns truthy for. The predicate is
+ * bound to `thisArg` and invoked with three arguments: (value, key, object).
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The source object.
+ * @param {Function|...(string|string[])} [predicate] The function invoked per
+ * iteration or property names to pick, specified as individual property
+ * names or arrays of property names.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Object} Returns the new object.
+ * @example
+ *
+ * var object = { 'user': 'fred', 'age': 40 };
+ *
+ * _.pick(object, 'user');
+ * // => { 'user': 'fred' }
+ *
+ * _.pick(object, _.isString);
+ * // => { 'user': 'fred' }
+ */
+ var pick = restParam(function(object, props) {
+ if (object == null) {
+ return {};
+ }
+ return typeof props[0] == 'function'
+ ? pickByCallback(object, bindCallback(props[0], props[1], 3))
+ : pickByArray(object, baseFlatten(props));
+ });
+
+ /**
+ * This method is like `_.get` except that if the resolved value is a function
+ * it is invoked with the `this` binding of its parent object and its result
+ * is returned.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path of the property to resolve.
+ * @param {*} [defaultValue] The value returned if the resolved value is `undefined`.
+ * @returns {*} Returns the resolved value.
+ * @example
+ *
+ * var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] };
+ *
+ * _.result(object, 'a[0].b.c1');
+ * // => 3
+ *
+ * _.result(object, 'a[0].b.c2');
+ * // => 4
+ *
+ * _.result(object, 'a.b.c', 'default');
+ * // => 'default'
+ *
+ * _.result(object, 'a.b.c', _.constant('default'));
+ * // => 'default'
+ */
+ function result(object, path, defaultValue) {
+ var result = object == null ? undefined : object[path];
+ if (result === undefined) {
+ if (object != null && !isKey(path, object)) {
+ path = toPath(path);
+ object = path.length == 1 ? object : baseGet(object, baseSlice(path, 0, -1));
+ result = object == null ? undefined : object[last(path)];
+ }
+ result = result === undefined ? defaultValue : result;
+ }
+ return isFunction(result) ? result.call(object) : result;
+ }
+
+ /**
+ * Sets the property value of `path` on `object`. If a portion of `path`
+ * does not exist it is created.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to augment.
+ * @param {Array|string} path The path of the property to set.
+ * @param {*} value The value to set.
+ * @returns {Object} Returns `object`.
+ * @example
+ *
+ * var object = { 'a': [{ 'b': { 'c': 3 } }] };
+ *
+ * _.set(object, 'a[0].b.c', 4);
+ * console.log(object.a[0].b.c);
+ * // => 4
+ *
+ * _.set(object, 'x[0].y.z', 5);
+ * console.log(object.x[0].y.z);
+ * // => 5
+ */
+ function set(object, path, value) {
+ if (object == null) {
+ return object;
+ }
+ var pathKey = (path + '');
+ path = (object[pathKey] != null || isKey(path, object)) ? [pathKey] : toPath(path);
+
+ var index = -1,
+ length = path.length,
+ lastIndex = length - 1,
+ nested = object;
+
+ while (nested != null && ++index < length) {
+ var key = path[index];
+ if (isObject(nested)) {
+ if (index == lastIndex) {
+ nested[key] = value;
+ } else if (nested[key] == null) {
+ nested[key] = isIndex(path[index + 1]) ? [] : {};
+ }
+ }
+ nested = nested[key];
+ }
+ return object;
+ }
+
+ /**
+ * An alternative to `_.reduce`; this method transforms `object` to a new
+ * `accumulator` object which is the result of running each of its own enumerable
+ * properties through `iteratee`, with each invocation potentially mutating
+ * the `accumulator` object. The `iteratee` is bound to `thisArg` and invoked
+ * with four arguments: (accumulator, value, key, object). Iteratee functions
+ * may exit iteration early by explicitly returning `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Array|Object} object The object to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [accumulator] The custom accumulator value.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {*} Returns the accumulated value.
+ * @example
+ *
+ * _.transform([2, 3, 4], function(result, n) {
+ * result.push(n *= n);
+ * return n % 2 == 0;
+ * });
+ * // => [4, 9]
+ *
+ * _.transform({ 'a': 1, 'b': 2 }, function(result, n, key) {
+ * result[key] = n * 3;
+ * });
+ * // => { 'a': 3, 'b': 6 }
+ */
+ function transform(object, iteratee, accumulator, thisArg) {
+ var isArr = isArray(object) || isTypedArray(object);
+ iteratee = getCallback(iteratee, thisArg, 4);
+
+ if (accumulator == null) {
+ if (isArr || isObject(object)) {
+ var Ctor = object.constructor;
+ if (isArr) {
+ accumulator = isArray(object) ? new Ctor : [];
+ } else {
+ accumulator = baseCreate(isFunction(Ctor) ? Ctor.prototype : undefined);
+ }
+ } else {
+ accumulator = {};
+ }
+ }
+ (isArr ? arrayEach : baseForOwn)(object, function(value, index, object) {
+ return iteratee(accumulator, value, index, object);
+ });
+ return accumulator;
+ }
+
+ /**
+ * Creates an array of the own enumerable property values of `object`.
+ *
+ * **Note:** Non-object values are coerced to objects.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property values.
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.values(new Foo);
+ * // => [1, 2] (iteration order is not guaranteed)
+ *
+ * _.values('hi');
+ * // => ['h', 'i']
+ */
+ function values(object) {
+ return baseValues(object, keys(object));
+ }
+
+ /**
+ * Creates an array of the own and inherited enumerable property values
+ * of `object`.
+ *
+ * **Note:** Non-object values are coerced to objects.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property values.
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.valuesIn(new Foo);
+ * // => [1, 2, 3] (iteration order is not guaranteed)
+ */
+ function valuesIn(object) {
+ return baseValues(object, keysIn(object));
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Checks if `n` is between `start` and up to but not including, `end`. If
+ * `end` is not specified it is set to `start` with `start` then set to `0`.
+ *
+ * @static
+ * @memberOf _
+ * @category Number
+ * @param {number} n The number to check.
+ * @param {number} [start=0] The start of the range.
+ * @param {number} end The end of the range.
+ * @returns {boolean} Returns `true` if `n` is in the range, else `false`.
+ * @example
+ *
+ * _.inRange(3, 2, 4);
+ * // => true
+ *
+ * _.inRange(4, 8);
+ * // => true
+ *
+ * _.inRange(4, 2);
+ * // => false
+ *
+ * _.inRange(2, 2);
+ * // => false
+ *
+ * _.inRange(1.2, 2);
+ * // => true
+ *
+ * _.inRange(5.2, 4);
+ * // => false
+ */
+ function inRange(value, start, end) {
+ start = +start || 0;
+ if (end === undefined) {
+ end = start;
+ start = 0;
+ } else {
+ end = +end || 0;
+ }
+ return value >= nativeMin(start, end) && value < nativeMax(start, end);
+ }
+
+ /**
+ * Produces a random number between `min` and `max` (inclusive). If only one
+ * argument is provided a number between `0` and the given number is returned.
+ * If `floating` is `true`, or either `min` or `max` are floats, a floating-point
+ * number is returned instead of an integer.
+ *
+ * @static
+ * @memberOf _
+ * @category Number
+ * @param {number} [min=0] The minimum possible value.
+ * @param {number} [max=1] The maximum possible value.
+ * @param {boolean} [floating] Specify returning a floating-point number.
+ * @returns {number} Returns the random number.
+ * @example
+ *
+ * _.random(0, 5);
+ * // => an integer between 0 and 5
+ *
+ * _.random(5);
+ * // => also an integer between 0 and 5
+ *
+ * _.random(5, true);
+ * // => a floating-point number between 0 and 5
+ *
+ * _.random(1.2, 5.2);
+ * // => a floating-point number between 1.2 and 5.2
+ */
+ function random(min, max, floating) {
+ if (floating && isIterateeCall(min, max, floating)) {
+ max = floating = undefined;
+ }
+ var noMin = min == null,
+ noMax = max == null;
+
+ if (floating == null) {
+ if (noMax && typeof min == 'boolean') {
+ floating = min;
+ min = 1;
+ }
+ else if (typeof max == 'boolean') {
+ floating = max;
+ noMax = true;
+ }
+ }
+ if (noMin && noMax) {
+ max = 1;
+ noMax = false;
+ }
+ min = +min || 0;
+ if (noMax) {
+ max = min;
+ min = 0;
+ } else {
+ max = +max || 0;
+ }
+ if (floating || min % 1 || max % 1) {
+ var rand = nativeRandom();
+ return nativeMin(min + (rand * (max - min + parseFloat('1e-' + ((rand + '').length - 1)))), max);
+ }
+ return baseRandom(min, max);
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase).
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to convert.
+ * @returns {string} Returns the camel cased string.
+ * @example
+ *
+ * _.camelCase('Foo Bar');
+ * // => 'fooBar'
+ *
+ * _.camelCase('--foo-bar');
+ * // => 'fooBar'
+ *
+ * _.camelCase('__foo_bar__');
+ * // => 'fooBar'
+ */
+ var camelCase = createCompounder(function(result, word, index) {
+ word = word.toLowerCase();
+ return result + (index ? (word.charAt(0).toUpperCase() + word.slice(1)) : word);
+ });
+
+ /**
+ * Capitalizes the first character of `string`.
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to capitalize.
+ * @returns {string} Returns the capitalized string.
+ * @example
+ *
+ * _.capitalize('fred');
+ * // => 'Fred'
+ */
+ function capitalize(string) {
+ string = baseToString(string);
+ return string && (string.charAt(0).toUpperCase() + string.slice(1));
+ }
+
+ /**
+ * Deburrs `string` by converting [latin-1 supplementary letters](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table)
+ * to basic latin letters and removing [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks).
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to deburr.
+ * @returns {string} Returns the deburred string.
+ * @example
+ *
+ * _.deburr('déjà vu');
+ * // => 'deja vu'
+ */
+ function deburr(string) {
+ string = baseToString(string);
+ return string && string.replace(reLatin1, deburrLetter).replace(reComboMark, '');
+ }
+
+ /**
+ * Checks if `string` ends with the given target string.
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to search.
+ * @param {string} [target] The string to search for.
+ * @param {number} [position=string.length] The position to search from.
+ * @returns {boolean} Returns `true` if `string` ends with `target`, else `false`.
+ * @example
+ *
+ * _.endsWith('abc', 'c');
+ * // => true
+ *
+ * _.endsWith('abc', 'b');
+ * // => false
+ *
+ * _.endsWith('abc', 'b', 2);
+ * // => true
+ */
+ function endsWith(string, target, position) {
+ string = baseToString(string);
+ target = (target + '');
+
+ var length = string.length;
+ position = position === undefined
+ ? length
+ : nativeMin(position < 0 ? 0 : (+position || 0), length);
+
+ position -= target.length;
+ return position >= 0 && string.indexOf(target, position) == position;
+ }
+
+ /**
+ * Converts the characters "&", "<", ">", '"', "'", and "\`", in `string` to
+ * their corresponding HTML entities.
+ *
+ * **Note:** No other characters are escaped. To escape additional characters
+ * use a third-party library like [_he_](https://mths.be/he).
+ *
+ * Though the ">" character is escaped for symmetry, characters like
+ * ">" and "/" don't need escaping in HTML and have no special meaning
+ * unless they're part of a tag or unquoted attribute value.
+ * See [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
+ * (under "semi-related fun fact") for more details.
+ *
+ * Backticks are escaped because in Internet Explorer < 9, they can break out
+ * of attribute values or HTML comments. See [#59](https://html5sec.org/#59),
+ * [#102](https://html5sec.org/#102), [#108](https://html5sec.org/#108), and
+ * [#133](https://html5sec.org/#133) of the [HTML5 Security Cheatsheet](https://html5sec.org/)
+ * for more details.
+ *
+ * When working with HTML you should always [quote attribute values](http://wonko.com/post/html-escaping)
+ * to reduce XSS vectors.
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to escape.
+ * @returns {string} Returns the escaped string.
+ * @example
+ *
+ * _.escape('fred, barney, & pebbles');
+ * // => 'fred, barney, &amp; pebbles'
+ */
+ function escape(string) {
+ // Reset `lastIndex` because in IE < 9 `String#replace` does not.
+ string = baseToString(string);
+ return (string && reHasUnescapedHtml.test(string))
+ ? string.replace(reUnescapedHtml, escapeHtmlChar)
+ : string;
+ }
+
+ /**
+ * Escapes the `RegExp` special characters "\", "/", "^", "$", ".", "|", "?",
+ * "*", "+", "(", ")", "[", "]", "{" and "}" in `string`.
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to escape.
+ * @returns {string} Returns the escaped string.
+ * @example
+ *
+ * _.escapeRegExp('[lodash](https://lodash.com/)');
+ * // => '\[lodash\]\(https:\/\/lodash\.com\/\)'
+ */
+ function escapeRegExp(string) {
+ string = baseToString(string);
+ return (string && reHasRegExpChars.test(string))
+ ? string.replace(reRegExpChars, escapeRegExpChar)
+ : (string || '(?:)');
+ }
+
+ /**
+ * Converts `string` to [kebab case](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles).
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to convert.
+ * @returns {string} Returns the kebab cased string.
+ * @example
+ *
+ * _.kebabCase('Foo Bar');
+ * // => 'foo-bar'
+ *
+ * _.kebabCase('fooBar');
+ * // => 'foo-bar'
+ *
+ * _.kebabCase('__foo_bar__');
+ * // => 'foo-bar'
+ */
+ var kebabCase = createCompounder(function(result, word, index) {
+ return result + (index ? '-' : '') + word.toLowerCase();
+ });
+
+ /**
+ * Pads `string` on the left and right sides if it's shorter than `length`.
+ * Padding characters are truncated if they can't be evenly divided by `length`.
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to pad.
+ * @param {number} [length=0] The padding length.
+ * @param {string} [chars=' '] The string used as padding.
+ * @returns {string} Returns the padded string.
+ * @example
+ *
+ * _.pad('abc', 8);
+ * // => ' abc '
+ *
+ * _.pad('abc', 8, '_-');
+ * // => '_-abc_-_'
+ *
+ * _.pad('abc', 3);
+ * // => 'abc'
+ */
+ function pad(string, length, chars) {
+ string = baseToString(string);
+ length = +length;
+
+ var strLength = string.length;
+ if (strLength >= length || !nativeIsFinite(length)) {
+ return string;
+ }
+ var mid = (length - strLength) / 2,
+ leftLength = nativeFloor(mid),
+ rightLength = nativeCeil(mid);
+
+ chars = createPadding('', rightLength, chars);
+ return chars.slice(0, leftLength) + string + chars;
+ }
+
+ /**
+ * Pads `string` on the left side if it's shorter than `length`. Padding
+ * characters are truncated if they exceed `length`.
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to pad.
+ * @param {number} [length=0] The padding length.
+ * @param {string} [chars=' '] The string used as padding.
+ * @returns {string} Returns the padded string.
+ * @example
+ *
+ * _.padLeft('abc', 6);
+ * // => ' abc'
+ *
+ * _.padLeft('abc', 6, '_-');
+ * // => '_-_abc'
+ *
+ * _.padLeft('abc', 3);
+ * // => 'abc'
+ */
+ var padLeft = createPadDir();
+
+ /**
+ * Pads `string` on the right side if it's shorter than `length`. Padding
+ * characters are truncated if they exceed `length`.
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to pad.
+ * @param {number} [length=0] The padding length.
+ * @param {string} [chars=' '] The string used as padding.
+ * @returns {string} Returns the padded string.
+ * @example
+ *
+ * _.padRight('abc', 6);
+ * // => 'abc '
+ *
+ * _.padRight('abc', 6, '_-');
+ * // => 'abc_-_'
+ *
+ * _.padRight('abc', 3);
+ * // => 'abc'
+ */
+ var padRight = createPadDir(true);
+
+ /**
+ * Converts `string` to an integer of the specified radix. If `radix` is
+ * `undefined` or `0`, a `radix` of `10` is used unless `value` is a hexadecimal,
+ * in which case a `radix` of `16` is used.
+ *
+ * **Note:** This method aligns with the [ES5 implementation](https://es5.github.io/#E)
+ * of `parseInt`.
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} string The string to convert.
+ * @param {number} [radix] The radix to interpret `value` by.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {number} Returns the converted integer.
+ * @example
+ *
+ * _.parseInt('08');
+ * // => 8
+ *
+ * _.map(['6', '08', '10'], _.parseInt);
+ * // => [6, 8, 10]
+ */
+ function parseInt(string, radix, guard) {
+ // Firefox < 21 and Opera < 15 follow ES3 for `parseInt`.
+ // Chrome fails to trim leading <BOM> whitespace characters.
+ // See https://code.google.com/p/v8/issues/detail?id=3109 for more details.
+ if (guard ? isIterateeCall(string, radix, guard) : radix == null) {
+ radix = 0;
+ } else if (radix) {
+ radix = +radix;
+ }
+ string = trim(string);
+ return nativeParseInt(string, radix || (reHasHexPrefix.test(string) ? 16 : 10));
+ }
+
+ /**
+ * Repeats the given string `n` times.
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to repeat.
+ * @param {number} [n=0] The number of times to repeat the string.
+ * @returns {string} Returns the repeated string.
+ * @example
+ *
+ * _.repeat('*', 3);
+ * // => '***'
+ *
+ * _.repeat('abc', 2);
+ * // => 'abcabc'
+ *
+ * _.repeat('abc', 0);
+ * // => ''
+ */
+ function repeat(string, n) {
+ var result = '';
+ string = baseToString(string);
+ n = +n;
+ if (n < 1 || !string || !nativeIsFinite(n)) {
+ return result;
+ }
+ // Leverage the exponentiation by squaring algorithm for a faster repeat.
+ // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.
+ do {
+ if (n % 2) {
+ result += string;
+ }
+ n = nativeFloor(n / 2);
+ string += string;
+ } while (n);
+
+ return result;
+ }
+
+ /**
+ * Converts `string` to [snake case](https://en.wikipedia.org/wiki/Snake_case).
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to convert.
+ * @returns {string} Returns the snake cased string.
+ * @example
+ *
+ * _.snakeCase('Foo Bar');
+ * // => 'foo_bar'
+ *
+ * _.snakeCase('fooBar');
+ * // => 'foo_bar'
+ *
+ * _.snakeCase('--foo-bar');
+ * // => 'foo_bar'
+ */
+ var snakeCase = createCompounder(function(result, word, index) {
+ return result + (index ? '_' : '') + word.toLowerCase();
+ });
+
+ /**
+ * Converts `string` to [start case](https://en.wikipedia.org/wiki/Letter_case#Stylistic_or_specialised_usage).
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to convert.
+ * @returns {string} Returns the start cased string.
+ * @example
+ *
+ * _.startCase('--foo-bar');
+ * // => 'Foo Bar'
+ *
+ * _.startCase('fooBar');
+ * // => 'Foo Bar'
+ *
+ * _.startCase('__foo_bar__');
+ * // => 'Foo Bar'
+ */
+ var startCase = createCompounder(function(result, word, index) {
+ return result + (index ? ' ' : '') + (word.charAt(0).toUpperCase() + word.slice(1));
+ });
+
+ /**
+ * Checks if `string` starts with the given target string.
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to search.
+ * @param {string} [target] The string to search for.
+ * @param {number} [position=0] The position to search from.
+ * @returns {boolean} Returns `true` if `string` starts with `target`, else `false`.
+ * @example
+ *
+ * _.startsWith('abc', 'a');
+ * // => true
+ *
+ * _.startsWith('abc', 'b');
+ * // => false
+ *
+ * _.startsWith('abc', 'b', 1);
+ * // => true
+ */
+ function startsWith(string, target, position) {
+ string = baseToString(string);
+ position = position == null
+ ? 0
+ : nativeMin(position < 0 ? 0 : (+position || 0), string.length);
+
+ return string.lastIndexOf(target, position) == position;
+ }
+
+ /**
+ * Creates a compiled template function that can interpolate data properties
+ * in "interpolate" delimiters, HTML-escape interpolated data properties in
+ * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data
+ * properties may be accessed as free variables in the template. If a setting
+ * object is provided it takes precedence over `_.templateSettings` values.
+ *
+ * **Note:** In the development build `_.template` utilizes
+ * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
+ * for easier debugging.
+ *
+ * For more information on precompiling templates see
+ * [lodash's custom builds documentation](https://lodash.com/custom-builds).
+ *
+ * For more information on Chrome extension sandboxes see
+ * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval).
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The template string.
+ * @param {Object} [options] The options object.
+ * @param {RegExp} [options.escape] The HTML "escape" delimiter.
+ * @param {RegExp} [options.evaluate] The "evaluate" delimiter.
+ * @param {Object} [options.imports] An object to import into the template as free variables.
+ * @param {RegExp} [options.interpolate] The "interpolate" delimiter.
+ * @param {string} [options.sourceURL] The sourceURL of the template's compiled source.
+ * @param {string} [options.variable] The data object variable name.
+ * @param- {Object} [otherOptions] Enables the legacy `options` param signature.
+ * @returns {Function} Returns the compiled template function.
+ * @example
+ *
+ * // using the "interpolate" delimiter to create a compiled template
+ * var compiled = _.template('hello <%= user %>!');
+ * compiled({ 'user': 'fred' });
+ * // => 'hello fred!'
+ *
+ * // using the HTML "escape" delimiter to escape data property values
+ * var compiled = _.template('<b><%- value %></b>');
+ * compiled({ 'value': '<script>' });
+ * // => '<b>&lt;script&gt;</b>'
+ *
+ * // using the "evaluate" delimiter to execute JavaScript and generate HTML
+ * var compiled = _.template('<% _.forEach(users, function(user) { %><li><%- user %></li><% }); %>');
+ * compiled({ 'users': ['fred', 'barney'] });
+ * // => '<li>fred</li><li>barney</li>'
+ *
+ * // using the internal `print` function in "evaluate" delimiters
+ * var compiled = _.template('<% print("hello " + user); %>!');
+ * compiled({ 'user': 'barney' });
+ * // => 'hello barney!'
+ *
+ * // using the ES delimiter as an alternative to the default "interpolate" delimiter
+ * var compiled = _.template('hello ${ user }!');
+ * compiled({ 'user': 'pebbles' });
+ * // => 'hello pebbles!'
+ *
+ * // using custom template delimiters
+ * _.templateSettings.interpolate = /{{([\s\S]+?)}}/g;
+ * var compiled = _.template('hello {{ user }}!');
+ * compiled({ 'user': 'mustache' });
+ * // => 'hello mustache!'
+ *
+ * // using backslashes to treat delimiters as plain text
+ * var compiled = _.template('<%= "\\<%- value %\\>" %>');
+ * compiled({ 'value': 'ignored' });
+ * // => '<%- value %>'
+ *
+ * // using the `imports` option to import `jQuery` as `jq`
+ * var text = '<% jq.each(users, function(user) { %><li><%- user %></li><% }); %>';
+ * var compiled = _.template(text, { 'imports': { 'jq': jQuery } });
+ * compiled({ 'users': ['fred', 'barney'] });
+ * // => '<li>fred</li><li>barney</li>'
+ *
+ * // using the `sourceURL` option to specify a custom sourceURL for the template
+ * var compiled = _.template('hello <%= user %>!', { 'sourceURL': '/basic/greeting.jst' });
+ * compiled(data);
+ * // => find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector
+ *
+ * // using the `variable` option to ensure a with-statement isn't used in the compiled template
+ * var compiled = _.template('hi <%= data.user %>!', { 'variable': 'data' });
+ * compiled.source;
+ * // => function(data) {
+ * // var __t, __p = '';
+ * // __p += 'hi ' + ((__t = ( data.user )) == null ? '' : __t) + '!';
+ * // return __p;
+ * // }
+ *
+ * // using the `source` property to inline compiled templates for meaningful
+ * // line numbers in error messages and a stack trace
+ * fs.writeFileSync(path.join(cwd, 'jst.js'), '\
+ * var JST = {\
+ * "main": ' + _.template(mainText).source + '\
+ * };\
+ * ');
+ */
+ function template(string, options, otherOptions) {
+ // Based on John Resig's `tmpl` implementation (http://ejohn.org/blog/javascript-micro-templating/)
+ // and Laura Doktorova's doT.js (https://github.com/olado/doT).
+ var settings = lodash.templateSettings;
+
+ if (otherOptions && isIterateeCall(string, options, otherOptions)) {
+ options = otherOptions = undefined;
+ }
+ string = baseToString(string);
+ options = assignWith(baseAssign({}, otherOptions || options), settings, assignOwnDefaults);
+
+ var imports = assignWith(baseAssign({}, options.imports), settings.imports, assignOwnDefaults),
+ importsKeys = keys(imports),
+ importsValues = baseValues(imports, importsKeys);
+
+ var isEscaping,
+ isEvaluating,
+ index = 0,
+ interpolate = options.interpolate || reNoMatch,
+ source = "__p += '";
+
+ // Compile the regexp to match each delimiter.
+ var reDelimiters = RegExp(
+ (options.escape || reNoMatch).source + '|' +
+ interpolate.source + '|' +
+ (interpolate === reInterpolate ? reEsTemplate : reNoMatch).source + '|' +
+ (options.evaluate || reNoMatch).source + '|$'
+ , 'g');
+
+ // Use a sourceURL for easier debugging.
+ var sourceURL = '//# sourceURL=' +
+ ('sourceURL' in options
+ ? options.sourceURL
+ : ('lodash.templateSources[' + (++templateCounter) + ']')
+ ) + '\n';
+
+ string.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) {
+ interpolateValue || (interpolateValue = esTemplateValue);
+
+ // Escape characters that can't be included in string literals.
+ source += string.slice(index, offset).replace(reUnescapedString, escapeStringChar);
+
+ // Replace delimiters with snippets.
+ if (escapeValue) {
+ isEscaping = true;
+ source += "' +\n__e(" + escapeValue + ") +\n'";
+ }
+ if (evaluateValue) {
+ isEvaluating = true;
+ source += "';\n" + evaluateValue + ";\n__p += '";
+ }
+ if (interpolateValue) {
+ source += "' +\n((__t = (" + interpolateValue + ")) == null ? '' : __t) +\n'";
+ }
+ index = offset + match.length;
+
+ // The JS engine embedded in Adobe products requires returning the `match`
+ // string in order to produce the correct `offset` value.
+ return match;
+ });
+
+ source += "';\n";
+
+ // If `variable` is not specified wrap a with-statement around the generated
+ // code to add the data object to the top of the scope chain.
+ var variable = options.variable;
+ if (!variable) {
+ source = 'with (obj) {\n' + source + '\n}\n';
+ }
+ // Cleanup code by stripping empty strings.
+ source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source)
+ .replace(reEmptyStringMiddle, '$1')
+ .replace(reEmptyStringTrailing, '$1;');
+
+ // Frame code as the function body.
+ source = 'function(' + (variable || 'obj') + ') {\n' +
+ (variable
+ ? ''
+ : 'obj || (obj = {});\n'
+ ) +
+ "var __t, __p = ''" +
+ (isEscaping
+ ? ', __e = _.escape'
+ : ''
+ ) +
+ (isEvaluating
+ ? ', __j = Array.prototype.join;\n' +
+ "function print() { __p += __j.call(arguments, '') }\n"
+ : ';\n'
+ ) +
+ source +
+ 'return __p\n}';
+
+ var result = attempt(function() {
+ return Function(importsKeys, sourceURL + 'return ' + source).apply(undefined, importsValues);
+ });
+
+ // Provide the compiled function's source by its `toString` method or
+ // the `source` property as a convenience for inlining compiled templates.
+ result.source = source;
+ if (isError(result)) {
+ throw result;
+ }
+ return result;
+ }
+
+ /**
+ * Removes leading and trailing whitespace or specified characters from `string`.
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to trim.
+ * @param {string} [chars=whitespace] The characters to trim.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {string} Returns the trimmed string.
+ * @example
+ *
+ * _.trim(' abc ');
+ * // => 'abc'
+ *
+ * _.trim('-_-abc-_-', '_-');
+ * // => 'abc'
+ *
+ * _.map([' foo ', ' bar '], _.trim);
+ * // => ['foo', 'bar']
+ */
+ function trim(string, chars, guard) {
+ var value = string;
+ string = baseToString(string);
+ if (!string) {
+ return string;
+ }
+ if (guard ? isIterateeCall(value, chars, guard) : chars == null) {
+ return string.slice(trimmedLeftIndex(string), trimmedRightIndex(string) + 1);
+ }
+ chars = (chars + '');
+ return string.slice(charsLeftIndex(string, chars), charsRightIndex(string, chars) + 1);
+ }
+
+ /**
+ * Removes leading whitespace or specified characters from `string`.
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to trim.
+ * @param {string} [chars=whitespace] The characters to trim.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {string} Returns the trimmed string.
+ * @example
+ *
+ * _.trimLeft(' abc ');
+ * // => 'abc '
+ *
+ * _.trimLeft('-_-abc-_-', '_-');
+ * // => 'abc-_-'
+ */
+ function trimLeft(string, chars, guard) {
+ var value = string;
+ string = baseToString(string);
+ if (!string) {
+ return string;
+ }
+ if (guard ? isIterateeCall(value, chars, guard) : chars == null) {
+ return string.slice(trimmedLeftIndex(string));
+ }
+ return string.slice(charsLeftIndex(string, (chars + '')));
+ }
+
+ /**
+ * Removes trailing whitespace or specified characters from `string`.
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to trim.
+ * @param {string} [chars=whitespace] The characters to trim.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {string} Returns the trimmed string.
+ * @example
+ *
+ * _.trimRight(' abc ');
+ * // => ' abc'
+ *
+ * _.trimRight('-_-abc-_-', '_-');
+ * // => '-_-abc'
+ */
+ function trimRight(string, chars, guard) {
+ var value = string;
+ string = baseToString(string);
+ if (!string) {
+ return string;
+ }
+ if (guard ? isIterateeCall(value, chars, guard) : chars == null) {
+ return string.slice(0, trimmedRightIndex(string) + 1);
+ }
+ return string.slice(0, charsRightIndex(string, (chars + '')) + 1);
+ }
+
+ /**
+ * Truncates `string` if it's longer than the given maximum string length.
+ * The last characters of the truncated string are replaced with the omission
+ * string which defaults to "...".
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to truncate.
+ * @param {Object|number} [options] The options object or maximum string length.
+ * @param {number} [options.length=30] The maximum string length.
+ * @param {string} [options.omission='...'] The string to indicate text is omitted.
+ * @param {RegExp|string} [options.separator] The separator pattern to truncate to.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {string} Returns the truncated string.
+ * @example
+ *
+ * _.trunc('hi-diddly-ho there, neighborino');
+ * // => 'hi-diddly-ho there, neighbo...'
+ *
+ * _.trunc('hi-diddly-ho there, neighborino', 24);
+ * // => 'hi-diddly-ho there, n...'
+ *
+ * _.trunc('hi-diddly-ho there, neighborino', {
+ * 'length': 24,
+ * 'separator': ' '
+ * });
+ * // => 'hi-diddly-ho there,...'
+ *
+ * _.trunc('hi-diddly-ho there, neighborino', {
+ * 'length': 24,
+ * 'separator': /,? +/
+ * });
+ * // => 'hi-diddly-ho there...'
+ *
+ * _.trunc('hi-diddly-ho there, neighborino', {
+ * 'omission': ' [...]'
+ * });
+ * // => 'hi-diddly-ho there, neig [...]'
+ */
+ function trunc(string, options, guard) {
+ if (guard && isIterateeCall(string, options, guard)) {
+ options = undefined;
+ }
+ var length = DEFAULT_TRUNC_LENGTH,
+ omission = DEFAULT_TRUNC_OMISSION;
+
+ if (options != null) {
+ if (isObject(options)) {
+ var separator = 'separator' in options ? options.separator : separator;
+ length = 'length' in options ? (+options.length || 0) : length;
+ omission = 'omission' in options ? baseToString(options.omission) : omission;
+ } else {
+ length = +options || 0;
+ }
+ }
+ string = baseToString(string);
+ if (length >= string.length) {
+ return string;
+ }
+ var end = length - omission.length;
+ if (end < 1) {
+ return omission;
+ }
+ var result = string.slice(0, end);
+ if (separator == null) {
+ return result + omission;
+ }
+ if (isRegExp(separator)) {
+ if (string.slice(end).search(separator)) {
+ var match,
+ newEnd,
+ substring = string.slice(0, end);
+
+ if (!separator.global) {
+ separator = RegExp(separator.source, (reFlags.exec(separator) || '') + 'g');
+ }
+ separator.lastIndex = 0;
+ while ((match = separator.exec(substring))) {
+ newEnd = match.index;
+ }
+ result = result.slice(0, newEnd == null ? end : newEnd);
+ }
+ } else if (string.indexOf(separator, end) != end) {
+ var index = result.lastIndexOf(separator);
+ if (index > -1) {
+ result = result.slice(0, index);
+ }
+ }
+ return result + omission;
+ }
+
+ /**
+ * The inverse of `_.escape`; this method converts the HTML entities
+ * `&amp;`, `&lt;`, `&gt;`, `&quot;`, `&#39;`, and `&#96;` in `string` to their
+ * corresponding characters.
+ *
+ * **Note:** No other HTML entities are unescaped. To unescape additional HTML
+ * entities use a third-party library like [_he_](https://mths.be/he).
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to unescape.
+ * @returns {string} Returns the unescaped string.
+ * @example
+ *
+ * _.unescape('fred, barney, &amp; pebbles');
+ * // => 'fred, barney, & pebbles'
+ */
+ function unescape(string) {
+ string = baseToString(string);
+ return (string && reHasEscapedHtml.test(string))
+ ? string.replace(reEscapedHtml, unescapeHtmlChar)
+ : string;
+ }
+
+ /**
+ * Splits `string` into an array of its words.
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to inspect.
+ * @param {RegExp|string} [pattern] The pattern to match words.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Array} Returns the words of `string`.
+ * @example
+ *
+ * _.words('fred, barney, & pebbles');
+ * // => ['fred', 'barney', 'pebbles']
+ *
+ * _.words('fred, barney, & pebbles', /[^, ]+/g);
+ * // => ['fred', 'barney', '&', 'pebbles']
+ */
+ function words(string, pattern, guard) {
+ if (guard && isIterateeCall(string, pattern, guard)) {
+ pattern = undefined;
+ }
+ string = baseToString(string);
+ return string.match(pattern || reWords) || [];
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Attempts to invoke `func`, returning either the result or the caught error
+ * object. Any additional arguments are provided to `func` when it is invoked.
+ *
+ * @static
+ * @memberOf _
+ * @category Utility
+ * @param {Function} func The function to attempt.
+ * @returns {*} Returns the `func` result or error object.
+ * @example
+ *
+ * // avoid throwing errors for invalid selectors
+ * var elements = _.attempt(function(selector) {
+ * return document.querySelectorAll(selector);
+ * }, '>_>');
+ *
+ * if (_.isError(elements)) {
+ * elements = [];
+ * }
+ */
+ var attempt = restParam(function(func, args) {
+ try {
+ return func.apply(undefined, args);
+ } catch(e) {
+ return isError(e) ? e : new Error(e);
+ }
+ });
+
+ /**
+ * Creates a function that invokes `func` with the `this` binding of `thisArg`
+ * and arguments of the created function. If `func` is a property name the
+ * created callback returns the property value for a given element. If `func`
+ * is an object the created callback returns `true` for elements that contain
+ * the equivalent object properties, otherwise it returns `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias iteratee
+ * @category Utility
+ * @param {*} [func=_.identity] The value to convert to a callback.
+ * @param {*} [thisArg] The `this` binding of `func`.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Function} Returns the callback.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36 },
+ * { 'user': 'fred', 'age': 40 }
+ * ];
+ *
+ * // wrap to create custom callback shorthands
+ * _.callback = _.wrap(_.callback, function(callback, func, thisArg) {
+ * var match = /^(.+?)__([gl]t)(.+)$/.exec(func);
+ * if (!match) {
+ * return callback(func, thisArg);
+ * }
+ * return function(object) {
+ * return match[2] == 'gt'
+ * ? object[match[1]] > match[3]
+ * : object[match[1]] < match[3];
+ * };
+ * });
+ *
+ * _.filter(users, 'age__gt36');
+ * // => [{ 'user': 'fred', 'age': 40 }]
+ */
+ function callback(func, thisArg, guard) {
+ if (guard && isIterateeCall(func, thisArg, guard)) {
+ thisArg = undefined;
+ }
+ return isObjectLike(func)
+ ? matches(func)
+ : baseCallback(func, thisArg);
+ }
+
+ /**
+ * Creates a function that returns `value`.
+ *
+ * @static
+ * @memberOf _
+ * @category Utility
+ * @param {*} value The value to return from the new function.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var object = { 'user': 'fred' };
+ * var getter = _.constant(object);
+ *
+ * getter() === object;
+ * // => true
+ */
+ function constant(value) {
+ return function() {
+ return value;
+ };
+ }
+
+ /**
+ * This method returns the first argument provided to it.
+ *
+ * @static
+ * @memberOf _
+ * @category Utility
+ * @param {*} value Any value.
+ * @returns {*} Returns `value`.
+ * @example
+ *
+ * var object = { 'user': 'fred' };
+ *
+ * _.identity(object) === object;
+ * // => true
+ */
+ function identity(value) {
+ return value;
+ }
+
+ /**
+ * Creates a function that performs a deep comparison between a given object
+ * and `source`, returning `true` if the given object has equivalent property
+ * values, else `false`.
+ *
+ * **Note:** This method supports comparing arrays, booleans, `Date` objects,
+ * numbers, `Object` objects, regexes, and strings. Objects are compared by
+ * their own, not inherited, enumerable properties. For comparing a single
+ * own or inherited property value see `_.matchesProperty`.
+ *
+ * @static
+ * @memberOf _
+ * @category Utility
+ * @param {Object} source The object of property values to match.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36, 'active': true },
+ * { 'user': 'fred', 'age': 40, 'active': false }
+ * ];
+ *
+ * _.filter(users, _.matches({ 'age': 40, 'active': false }));
+ * // => [{ 'user': 'fred', 'age': 40, 'active': false }]
+ */
+ function matches(source) {
+ return baseMatches(baseClone(source, true));
+ }
+
+ /**
+ * Creates a function that compares the property value of `path` on a given
+ * object to `value`.
+ *
+ * **Note:** This method supports comparing arrays, booleans, `Date` objects,
+ * numbers, `Object` objects, regexes, and strings. Objects are compared by
+ * their own, not inherited, enumerable properties.
+ *
+ * @static
+ * @memberOf _
+ * @category Utility
+ * @param {Array|string} path The path of the property to get.
+ * @param {*} srcValue The value to match.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney' },
+ * { 'user': 'fred' }
+ * ];
+ *
+ * _.find(users, _.matchesProperty('user', 'fred'));
+ * // => { 'user': 'fred' }
+ */
+ function matchesProperty(path, srcValue) {
+ return baseMatchesProperty(path, baseClone(srcValue, true));
+ }
+
+ /**
+ * Creates a function that invokes the method at `path` on a given object.
+ * Any additional arguments are provided to the invoked method.
+ *
+ * @static
+ * @memberOf _
+ * @category Utility
+ * @param {Array|string} path The path of the method to invoke.
+ * @param {...*} [args] The arguments to invoke the method with.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var objects = [
+ * { 'a': { 'b': { 'c': _.constant(2) } } },
+ * { 'a': { 'b': { 'c': _.constant(1) } } }
+ * ];
+ *
+ * _.map(objects, _.method('a.b.c'));
+ * // => [2, 1]
+ *
+ * _.invoke(_.sortBy(objects, _.method(['a', 'b', 'c'])), 'a.b.c');
+ * // => [1, 2]
+ */
+ var method = restParam(function(path, args) {
+ return function(object) {
+ return invokePath(object, path, args);
+ };
+ });
+
+ /**
+ * The opposite of `_.method`; this method creates a function that invokes
+ * the method at a given path on `object`. Any additional arguments are
+ * provided to the invoked method.
+ *
+ * @static
+ * @memberOf _
+ * @category Utility
+ * @param {Object} object The object to query.
+ * @param {...*} [args] The arguments to invoke the method with.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var array = _.times(3, _.constant),
+ * object = { 'a': array, 'b': array, 'c': array };
+ *
+ * _.map(['a[2]', 'c[0]'], _.methodOf(object));
+ * // => [2, 0]
+ *
+ * _.map([['a', '2'], ['c', '0']], _.methodOf(object));
+ * // => [2, 0]
+ */
+ var methodOf = restParam(function(object, args) {
+ return function(path) {
+ return invokePath(object, path, args);
+ };
+ });
+
+ /**
+ * Adds all own enumerable function properties of a source object to the
+ * destination object. If `object` is a function then methods are added to
+ * its prototype as well.
+ *
+ * **Note:** Use `_.runInContext` to create a pristine `lodash` function to
+ * avoid conflicts caused by modifying the original.
+ *
+ * @static
+ * @memberOf _
+ * @category Utility
+ * @param {Function|Object} [object=lodash] The destination object.
+ * @param {Object} source The object of functions to add.
+ * @param {Object} [options] The options object.
+ * @param {boolean} [options.chain=true] Specify whether the functions added
+ * are chainable.
+ * @returns {Function|Object} Returns `object`.
+ * @example
+ *
+ * function vowels(string) {
+ * return _.filter(string, function(v) {
+ * return /[aeiou]/i.test(v);
+ * });
+ * }
+ *
+ * _.mixin({ 'vowels': vowels });
+ * _.vowels('fred');
+ * // => ['e']
+ *
+ * _('fred').vowels().value();
+ * // => ['e']
+ *
+ * _.mixin({ 'vowels': vowels }, { 'chain': false });
+ * _('fred').vowels();
+ * // => ['e']
+ */
+ function mixin(object, source, options) {
+ if (options == null) {
+ var isObj = isObject(source),
+ props = isObj ? keys(source) : undefined,
+ methodNames = (props && props.length) ? baseFunctions(source, props) : undefined;
+
+ if (!(methodNames ? methodNames.length : isObj)) {
+ methodNames = false;
+ options = source;
+ source = object;
+ object = this;
+ }
+ }
+ if (!methodNames) {
+ methodNames = baseFunctions(source, keys(source));
+ }
+ var chain = true,
+ index = -1,
+ isFunc = isFunction(object),
+ length = methodNames.length;
+
+ if (options === false) {
+ chain = false;
+ } else if (isObject(options) && 'chain' in options) {
+ chain = options.chain;
+ }
+ while (++index < length) {
+ var methodName = methodNames[index],
+ func = source[methodName];
+
+ object[methodName] = func;
+ if (isFunc) {
+ object.prototype[methodName] = (function(func) {
+ return function() {
+ var chainAll = this.__chain__;
+ if (chain || chainAll) {
+ var result = object(this.__wrapped__),
+ actions = result.__actions__ = arrayCopy(this.__actions__);
+
+ actions.push({ 'func': func, 'args': arguments, 'thisArg': object });
+ result.__chain__ = chainAll;
+ return result;
+ }
+ return func.apply(object, arrayPush([this.value()], arguments));
+ };
+ }(func));
+ }
+ }
+ return object;
+ }
+
+ /**
+ * Reverts the `_` variable to its previous value and returns a reference to
+ * the `lodash` function.
+ *
+ * @static
+ * @memberOf _
+ * @category Utility
+ * @returns {Function} Returns the `lodash` function.
+ * @example
+ *
+ * var lodash = _.noConflict();
+ */
+ function noConflict() {
+ root._ = oldDash;
+ return this;
+ }
+
+ /**
+ * A no-operation function that returns `undefined` regardless of the
+ * arguments it receives.
+ *
+ * @static
+ * @memberOf _
+ * @category Utility
+ * @example
+ *
+ * var object = { 'user': 'fred' };
+ *
+ * _.noop(object) === undefined;
+ * // => true
+ */
+ function noop() {
+ // No operation performed.
+ }
+
+ /**
+ * Creates a function that returns the property value at `path` on a
+ * given object.
+ *
+ * @static
+ * @memberOf _
+ * @category Utility
+ * @param {Array|string} path The path of the property to get.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var objects = [
+ * { 'a': { 'b': { 'c': 2 } } },
+ * { 'a': { 'b': { 'c': 1 } } }
+ * ];
+ *
+ * _.map(objects, _.property('a.b.c'));
+ * // => [2, 1]
+ *
+ * _.pluck(_.sortBy(objects, _.property(['a', 'b', 'c'])), 'a.b.c');
+ * // => [1, 2]
+ */
+ function property(path) {
+ return isKey(path) ? baseProperty(path) : basePropertyDeep(path);
+ }
+
+ /**
+ * The opposite of `_.property`; this method creates a function that returns
+ * the property value at a given path on `object`.
+ *
+ * @static
+ * @memberOf _
+ * @category Utility
+ * @param {Object} object The object to query.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var array = [0, 1, 2],
+ * object = { 'a': array, 'b': array, 'c': array };
+ *
+ * _.map(['a[2]', 'c[0]'], _.propertyOf(object));
+ * // => [2, 0]
+ *
+ * _.map([['a', '2'], ['c', '0']], _.propertyOf(object));
+ * // => [2, 0]
+ */
+ function propertyOf(object) {
+ return function(path) {
+ return baseGet(object, toPath(path), path + '');
+ };
+ }
+
+ /**
+ * Creates an array of numbers (positive and/or negative) progressing from
+ * `start` up to, but not including, `end`. If `end` is not specified it is
+ * set to `start` with `start` then set to `0`. If `end` is less than `start`
+ * a zero-length range is created unless a negative `step` is specified.
+ *
+ * @static
+ * @memberOf _
+ * @category Utility
+ * @param {number} [start=0] The start of the range.
+ * @param {number} end The end of the range.
+ * @param {number} [step=1] The value to increment or decrement by.
+ * @returns {Array} Returns the new array of numbers.
+ * @example
+ *
+ * _.range(4);
+ * // => [0, 1, 2, 3]
+ *
+ * _.range(1, 5);
+ * // => [1, 2, 3, 4]
+ *
+ * _.range(0, 20, 5);
+ * // => [0, 5, 10, 15]
+ *
+ * _.range(0, -4, -1);
+ * // => [0, -1, -2, -3]
+ *
+ * _.range(1, 4, 0);
+ * // => [1, 1, 1]
+ *
+ * _.range(0);
+ * // => []
+ */
+ function range(start, end, step) {
+ if (step && isIterateeCall(start, end, step)) {
+ end = step = undefined;
+ }
+ start = +start || 0;
+ step = step == null ? 1 : (+step || 0);
+
+ if (end == null) {
+ end = start;
+ start = 0;
+ } else {
+ end = +end || 0;
+ }
+ // Use `Array(length)` so engines like Chakra and V8 avoid slower modes.
+ // See https://youtu.be/XAqIpGU8ZZk#t=17m25s for more details.
+ var index = -1,
+ length = nativeMax(nativeCeil((end - start) / (step || 1)), 0),
+ result = Array(length);
+
+ while (++index < length) {
+ result[index] = start;
+ start += step;
+ }
+ return result;
+ }
+
+ /**
+ * Invokes the iteratee function `n` times, returning an array of the results
+ * of each invocation. The `iteratee` is bound to `thisArg` and invoked with
+ * one argument; (index).
+ *
+ * @static
+ * @memberOf _
+ * @category Utility
+ * @param {number} n The number of times to invoke `iteratee`.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Array} Returns the array of results.
+ * @example
+ *
+ * var diceRolls = _.times(3, _.partial(_.random, 1, 6, false));
+ * // => [3, 6, 4]
+ *
+ * _.times(3, function(n) {
+ * mage.castSpell(n);
+ * });
+ * // => invokes `mage.castSpell(n)` three times with `n` of `0`, `1`, and `2`
+ *
+ * _.times(3, function(n) {
+ * this.cast(n);
+ * }, mage);
+ * // => also invokes `mage.castSpell(n)` three times
+ */
+ function times(n, iteratee, thisArg) {
+ n = nativeFloor(n);
+
+ // Exit early to avoid a JSC JIT bug in Safari 8
+ // where `Array(0)` is treated as `Array(1)`.
+ if (n < 1 || !nativeIsFinite(n)) {
+ return [];
+ }
+ var index = -1,
+ result = Array(nativeMin(n, MAX_ARRAY_LENGTH));
+
+ iteratee = bindCallback(iteratee, thisArg, 1);
+ while (++index < n) {
+ if (index < MAX_ARRAY_LENGTH) {
+ result[index] = iteratee(index);
+ } else {
+ iteratee(index);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Generates a unique ID. If `prefix` is provided the ID is appended to it.
+ *
+ * @static
+ * @memberOf _
+ * @category Utility
+ * @param {string} [prefix] The value to prefix the ID with.
+ * @returns {string} Returns the unique ID.
+ * @example
+ *
+ * _.uniqueId('contact_');
+ * // => 'contact_104'
+ *
+ * _.uniqueId();
+ * // => '105'
+ */
+ function uniqueId(prefix) {
+ var id = ++idCounter;
+ return baseToString(prefix) + id;
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Adds two numbers.
+ *
+ * @static
+ * @memberOf _
+ * @category Math
+ * @param {number} augend The first number to add.
+ * @param {number} addend The second number to add.
+ * @returns {number} Returns the sum.
+ * @example
+ *
+ * _.add(6, 4);
+ * // => 10
+ */
+ function add(augend, addend) {
+ return (+augend || 0) + (+addend || 0);
+ }
+
+ /**
+ * Calculates `n` rounded up to `precision`.
+ *
+ * @static
+ * @memberOf _
+ * @category Math
+ * @param {number} n The number to round up.
+ * @param {number} [precision=0] The precision to round up to.
+ * @returns {number} Returns the rounded up number.
+ * @example
+ *
+ * _.ceil(4.006);
+ * // => 5
+ *
+ * _.ceil(6.004, 2);
+ * // => 6.01
+ *
+ * _.ceil(6040, -2);
+ * // => 6100
+ */
+ var ceil = createRound('ceil');
+
+ /**
+ * Calculates `n` rounded down to `precision`.
+ *
+ * @static
+ * @memberOf _
+ * @category Math
+ * @param {number} n The number to round down.
+ * @param {number} [precision=0] The precision to round down to.
+ * @returns {number} Returns the rounded down number.
+ * @example
+ *
+ * _.floor(4.006);
+ * // => 4
+ *
+ * _.floor(0.046, 2);
+ * // => 0.04
+ *
+ * _.floor(4060, -2);
+ * // => 4000
+ */
+ var floor = createRound('floor');
+
+ /**
+ * Gets the maximum value of `collection`. If `collection` is empty or falsey
+ * `-Infinity` is returned. If an iteratee function is provided it is invoked
+ * for each value in `collection` to generate the criterion by which the value
+ * is ranked. The `iteratee` is bound to `thisArg` and invoked with three
+ * arguments: (value, index, collection).
+ *
+ * If a property name is provided for `iteratee` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `iteratee` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Math
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [iteratee] The function invoked per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {*} Returns the maximum value.
+ * @example
+ *
+ * _.max([4, 2, 8, 6]);
+ * // => 8
+ *
+ * _.max([]);
+ * // => -Infinity
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36 },
+ * { 'user': 'fred', 'age': 40 }
+ * ];
+ *
+ * _.max(users, function(chr) {
+ * return chr.age;
+ * });
+ * // => { 'user': 'fred', 'age': 40 }
+ *
+ * // using the `_.property` callback shorthand
+ * _.max(users, 'age');
+ * // => { 'user': 'fred', 'age': 40 }
+ */
+ var max = createExtremum(gt, NEGATIVE_INFINITY);
+
+ /**
+ * Gets the minimum value of `collection`. If `collection` is empty or falsey
+ * `Infinity` is returned. If an iteratee function is provided it is invoked
+ * for each value in `collection` to generate the criterion by which the value
+ * is ranked. The `iteratee` is bound to `thisArg` and invoked with three
+ * arguments: (value, index, collection).
+ *
+ * If a property name is provided for `iteratee` the created `_.property`
+ * style callback returns the property value of the given element.
+ *
+ * If a value is also provided for `thisArg` the created `_.matchesProperty`
+ * style callback returns `true` for elements that have a matching property
+ * value, else `false`.
+ *
+ * If an object is provided for `iteratee` the created `_.matches` style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Math
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [iteratee] The function invoked per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {*} Returns the minimum value.
+ * @example
+ *
+ * _.min([4, 2, 8, 6]);
+ * // => 2
+ *
+ * _.min([]);
+ * // => Infinity
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36 },
+ * { 'user': 'fred', 'age': 40 }
+ * ];
+ *
+ * _.min(users, function(chr) {
+ * return chr.age;
+ * });
+ * // => { 'user': 'barney', 'age': 36 }
+ *
+ * // using the `_.property` callback shorthand
+ * _.min(users, 'age');
+ * // => { 'user': 'barney', 'age': 36 }
+ */
+ var min = createExtremum(lt, POSITIVE_INFINITY);
+
+ /**
+ * Calculates `n` rounded to `precision`.
+ *
+ * @static
+ * @memberOf _
+ * @category Math
+ * @param {number} n The number to round.
+ * @param {number} [precision=0] The precision to round to.
+ * @returns {number} Returns the rounded number.
+ * @example
+ *
+ * _.round(4.006);
+ * // => 4
+ *
+ * _.round(4.006, 2);
+ * // => 4.01
+ *
+ * _.round(4060, -2);
+ * // => 4100
+ */
+ var round = createRound('round');
+
+ /**
+ * Gets the sum of the values in `collection`.
+ *
+ * @static
+ * @memberOf _
+ * @category Math
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [iteratee] The function invoked per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {number} Returns the sum.
+ * @example
+ *
+ * _.sum([4, 6]);
+ * // => 10
+ *
+ * _.sum({ 'a': 4, 'b': 6 });
+ * // => 10
+ *
+ * var objects = [
+ * { 'n': 4 },
+ * { 'n': 6 }
+ * ];
+ *
+ * _.sum(objects, function(object) {
+ * return object.n;
+ * });
+ * // => 10
+ *
+ * // using the `_.property` callback shorthand
+ * _.sum(objects, 'n');
+ * // => 10
+ */
+ function sum(collection, iteratee, thisArg) {
+ if (thisArg && isIterateeCall(collection, iteratee, thisArg)) {
+ iteratee = undefined;
+ }
+ iteratee = getCallback(iteratee, thisArg, 3);
+ return iteratee.length == 1
+ ? arraySum(isArray(collection) ? collection : toIterable(collection), iteratee)
+ : baseSum(collection, iteratee);
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ // Ensure wrappers are instances of `baseLodash`.
+ lodash.prototype = baseLodash.prototype;
+
+ LodashWrapper.prototype = baseCreate(baseLodash.prototype);
+ LodashWrapper.prototype.constructor = LodashWrapper;
+
+ LazyWrapper.prototype = baseCreate(baseLodash.prototype);
+ LazyWrapper.prototype.constructor = LazyWrapper;
+
+ // Add functions to the `Map` cache.
+ MapCache.prototype['delete'] = mapDelete;
+ MapCache.prototype.get = mapGet;
+ MapCache.prototype.has = mapHas;
+ MapCache.prototype.set = mapSet;
+
+ // Add functions to the `Set` cache.
+ SetCache.prototype.push = cachePush;
+
+ // Assign cache to `_.memoize`.
+ memoize.Cache = MapCache;
+
+ // Add functions that return wrapped values when chaining.
+ lodash.after = after;
+ lodash.ary = ary;
+ lodash.assign = assign;
+ lodash.at = at;
+ lodash.before = before;
+ lodash.bind = bind;
+ lodash.bindAll = bindAll;
+ lodash.bindKey = bindKey;
+ lodash.callback = callback;
+ lodash.chain = chain;
+ lodash.chunk = chunk;
+ lodash.compact = compact;
+ lodash.constant = constant;
+ lodash.countBy = countBy;
+ lodash.create = create;
+ lodash.curry = curry;
+ lodash.curryRight = curryRight;
+ lodash.debounce = debounce;
+ lodash.defaults = defaults;
+ lodash.defaultsDeep = defaultsDeep;
+ lodash.defer = defer;
+ lodash.delay = delay;
+ lodash.difference = difference;
+ lodash.drop = drop;
+ lodash.dropRight = dropRight;
+ lodash.dropRightWhile = dropRightWhile;
+ lodash.dropWhile = dropWhile;
+ lodash.fill = fill;
+ lodash.filter = filter;
+ lodash.flatten = flatten;
+ lodash.flattenDeep = flattenDeep;
+ lodash.flow = flow;
+ lodash.flowRight = flowRight;
+ lodash.forEach = forEach;
+ lodash.forEachRight = forEachRight;
+ lodash.forIn = forIn;
+ lodash.forInRight = forInRight;
+ lodash.forOwn = forOwn;
+ lodash.forOwnRight = forOwnRight;
+ lodash.functions = functions;
+ lodash.groupBy = groupBy;
+ lodash.indexBy = indexBy;
+ lodash.initial = initial;
+ lodash.intersection = intersection;
+ lodash.invert = invert;
+ lodash.invoke = invoke;
+ lodash.keys = keys;
+ lodash.keysIn = keysIn;
+ lodash.map = map;
+ lodash.mapKeys = mapKeys;
+ lodash.mapValues = mapValues;
+ lodash.matches = matches;
+ lodash.matchesProperty = matchesProperty;
+ lodash.memoize = memoize;
+ lodash.merge = merge;
+ lodash.method = method;
+ lodash.methodOf = methodOf;
+ lodash.mixin = mixin;
+ lodash.modArgs = modArgs;
+ lodash.negate = negate;
+ lodash.omit = omit;
+ lodash.once = once;
+ lodash.pairs = pairs;
+ lodash.partial = partial;
+ lodash.partialRight = partialRight;
+ lodash.partition = partition;
+ lodash.pick = pick;
+ lodash.pluck = pluck;
+ lodash.property = property;
+ lodash.propertyOf = propertyOf;
+ lodash.pull = pull;
+ lodash.pullAt = pullAt;
+ lodash.range = range;
+ lodash.rearg = rearg;
+ lodash.reject = reject;
+ lodash.remove = remove;
+ lodash.rest = rest;
+ lodash.restParam = restParam;
+ lodash.set = set;
+ lodash.shuffle = shuffle;
+ lodash.slice = slice;
+ lodash.sortBy = sortBy;
+ lodash.sortByAll = sortByAll;
+ lodash.sortByOrder = sortByOrder;
+ lodash.spread = spread;
+ lodash.take = take;
+ lodash.takeRight = takeRight;
+ lodash.takeRightWhile = takeRightWhile;
+ lodash.takeWhile = takeWhile;
+ lodash.tap = tap;
+ lodash.throttle = throttle;
+ lodash.thru = thru;
+ lodash.times = times;
+ lodash.toArray = toArray;
+ lodash.toPlainObject = toPlainObject;
+ lodash.transform = transform;
+ lodash.union = union;
+ lodash.uniq = uniq;
+ lodash.unzip = unzip;
+ lodash.unzipWith = unzipWith;
+ lodash.values = values;
+ lodash.valuesIn = valuesIn;
+ lodash.where = where;
+ lodash.without = without;
+ lodash.wrap = wrap;
+ lodash.xor = xor;
+ lodash.zip = zip;
+ lodash.zipObject = zipObject;
+ lodash.zipWith = zipWith;
+
+ // Add aliases.
+ lodash.backflow = flowRight;
+ lodash.collect = map;
+ lodash.compose = flowRight;
+ lodash.each = forEach;
+ lodash.eachRight = forEachRight;
+ lodash.extend = assign;
+ lodash.iteratee = callback;
+ lodash.methods = functions;
+ lodash.object = zipObject;
+ lodash.select = filter;
+ lodash.tail = rest;
+ lodash.unique = uniq;
+
+ // Add functions to `lodash.prototype`.
+ mixin(lodash, lodash);
+
+ /*------------------------------------------------------------------------*/
+
+ // Add functions that return unwrapped values when chaining.
+ lodash.add = add;
+ lodash.attempt = attempt;
+ lodash.camelCase = camelCase;
+ lodash.capitalize = capitalize;
+ lodash.ceil = ceil;
+ lodash.clone = clone;
+ lodash.cloneDeep = cloneDeep;
+ lodash.deburr = deburr;
+ lodash.endsWith = endsWith;
+ lodash.escape = escape;
+ lodash.escapeRegExp = escapeRegExp;
+ lodash.every = every;
+ lodash.find = find;
+ lodash.findIndex = findIndex;
+ lodash.findKey = findKey;
+ lodash.findLast = findLast;
+ lodash.findLastIndex = findLastIndex;
+ lodash.findLastKey = findLastKey;
+ lodash.findWhere = findWhere;
+ lodash.first = first;
+ lodash.floor = floor;
+ lodash.get = get;
+ lodash.gt = gt;
+ lodash.gte = gte;
+ lodash.has = has;
+ lodash.identity = identity;
+ lodash.includes = includes;
+ lodash.indexOf = indexOf;
+ lodash.inRange = inRange;
+ lodash.isArguments = isArguments;
+ lodash.isArray = isArray;
+ lodash.isBoolean = isBoolean;
+ lodash.isDate = isDate;
+ lodash.isElement = isElement;
+ lodash.isEmpty = isEmpty;
+ lodash.isEqual = isEqual;
+ lodash.isError = isError;
+ lodash.isFinite = isFinite;
+ lodash.isFunction = isFunction;
+ lodash.isMatch = isMatch;
+ lodash.isNaN = isNaN;
+ lodash.isNative = isNative;
+ lodash.isNull = isNull;
+ lodash.isNumber = isNumber;
+ lodash.isObject = isObject;
+ lodash.isPlainObject = isPlainObject;
+ lodash.isRegExp = isRegExp;
+ lodash.isString = isString;
+ lodash.isTypedArray = isTypedArray;
+ lodash.isUndefined = isUndefined;
+ lodash.kebabCase = kebabCase;
+ lodash.last = last;
+ lodash.lastIndexOf = lastIndexOf;
+ lodash.lt = lt;
+ lodash.lte = lte;
+ lodash.max = max;
+ lodash.min = min;
+ lodash.noConflict = noConflict;
+ lodash.noop = noop;
+ lodash.now = now;
+ lodash.pad = pad;
+ lodash.padLeft = padLeft;
+ lodash.padRight = padRight;
+ lodash.parseInt = parseInt;
+ lodash.random = random;
+ lodash.reduce = reduce;
+ lodash.reduceRight = reduceRight;
+ lodash.repeat = repeat;
+ lodash.result = result;
+ lodash.round = round;
+ lodash.runInContext = runInContext;
+ lodash.size = size;
+ lodash.snakeCase = snakeCase;
+ lodash.some = some;
+ lodash.sortedIndex = sortedIndex;
+ lodash.sortedLastIndex = sortedLastIndex;
+ lodash.startCase = startCase;
+ lodash.startsWith = startsWith;
+ lodash.sum = sum;
+ lodash.template = template;
+ lodash.trim = trim;
+ lodash.trimLeft = trimLeft;
+ lodash.trimRight = trimRight;
+ lodash.trunc = trunc;
+ lodash.unescape = unescape;
+ lodash.uniqueId = uniqueId;
+ lodash.words = words;
+
+ // Add aliases.
+ lodash.all = every;
+ lodash.any = some;
+ lodash.contains = includes;
+ lodash.eq = isEqual;
+ lodash.detect = find;
+ lodash.foldl = reduce;
+ lodash.foldr = reduceRight;
+ lodash.head = first;
+ lodash.include = includes;
+ lodash.inject = reduce;
+
+ mixin(lodash, (function() {
+ var source = {};
+ baseForOwn(lodash, function(func, methodName) {
+ if (!lodash.prototype[methodName]) {
+ source[methodName] = func;
+ }
+ });
+ return source;
+ }()), false);
+
+ /*------------------------------------------------------------------------*/
+
+ // Add functions capable of returning wrapped and unwrapped values when chaining.
+ lodash.sample = sample;
+
+ lodash.prototype.sample = function(n) {
+ if (!this.__chain__ && n == null) {
+ return sample(this.value());
+ }
+ return this.thru(function(value) {
+ return sample(value, n);
+ });
+ };
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * The semantic version number.
+ *
+ * @static
+ * @memberOf _
+ * @type string
+ */
+ lodash.VERSION = VERSION;
+
+ // Assign default placeholders.
+ arrayEach(['bind', 'bindKey', 'curry', 'curryRight', 'partial', 'partialRight'], function(methodName) {
+ lodash[methodName].placeholder = lodash;
+ });
+
+ // Add `LazyWrapper` methods for `_.drop` and `_.take` variants.
+ arrayEach(['drop', 'take'], function(methodName, index) {
+ LazyWrapper.prototype[methodName] = function(n) {
+ var filtered = this.__filtered__;
+ if (filtered && !index) {
+ return new LazyWrapper(this);
+ }
+ n = n == null ? 1 : nativeMax(nativeFloor(n) || 0, 0);
+
+ var result = this.clone();
+ if (filtered) {
+ result.__takeCount__ = nativeMin(result.__takeCount__, n);
+ } else {
+ result.__views__.push({ 'size': n, 'type': methodName + (result.__dir__ < 0 ? 'Right' : '') });
+ }
+ return result;
+ };
+
+ LazyWrapper.prototype[methodName + 'Right'] = function(n) {
+ return this.reverse()[methodName](n).reverse();
+ };
+ });
+
+ // Add `LazyWrapper` methods that accept an `iteratee` value.
+ arrayEach(['filter', 'map', 'takeWhile'], function(methodName, index) {
+ var type = index + 1,
+ isFilter = type != LAZY_MAP_FLAG;
+
+ LazyWrapper.prototype[methodName] = function(iteratee, thisArg) {
+ var result = this.clone();
+ result.__iteratees__.push({ 'iteratee': getCallback(iteratee, thisArg, 1), 'type': type });
+ result.__filtered__ = result.__filtered__ || isFilter;
+ return result;
+ };
+ });
+
+ // Add `LazyWrapper` methods for `_.first` and `_.last`.
+ arrayEach(['first', 'last'], function(methodName, index) {
+ var takeName = 'take' + (index ? 'Right' : '');
+
+ LazyWrapper.prototype[methodName] = function() {
+ return this[takeName](1).value()[0];
+ };
+ });
+
+ // Add `LazyWrapper` methods for `_.initial` and `_.rest`.
+ arrayEach(['initial', 'rest'], function(methodName, index) {
+ var dropName = 'drop' + (index ? '' : 'Right');
+
+ LazyWrapper.prototype[methodName] = function() {
+ return this.__filtered__ ? new LazyWrapper(this) : this[dropName](1);
+ };
+ });
+
+ // Add `LazyWrapper` methods for `_.pluck` and `_.where`.
+ arrayEach(['pluck', 'where'], function(methodName, index) {
+ var operationName = index ? 'filter' : 'map',
+ createCallback = index ? baseMatches : property;
+
+ LazyWrapper.prototype[methodName] = function(value) {
+ return this[operationName](createCallback(value));
+ };
+ });
+
+ LazyWrapper.prototype.compact = function() {
+ return this.filter(identity);
+ };
+
+ LazyWrapper.prototype.reject = function(predicate, thisArg) {
+ predicate = getCallback(predicate, thisArg, 1);
+ return this.filter(function(value) {
+ return !predicate(value);
+ });
+ };
+
+ LazyWrapper.prototype.slice = function(start, end) {
+ start = start == null ? 0 : (+start || 0);
+
+ var result = this;
+ if (result.__filtered__ && (start > 0 || end < 0)) {
+ return new LazyWrapper(result);
+ }
+ if (start < 0) {
+ result = result.takeRight(-start);
+ } else if (start) {
+ result = result.drop(start);
+ }
+ if (end !== undefined) {
+ end = (+end || 0);
+ result = end < 0 ? result.dropRight(-end) : result.take(end - start);
+ }
+ return result;
+ };
+
+ LazyWrapper.prototype.takeRightWhile = function(predicate, thisArg) {
+ return this.reverse().takeWhile(predicate, thisArg).reverse();
+ };
+
+ LazyWrapper.prototype.toArray = function() {
+ return this.take(POSITIVE_INFINITY);
+ };
+
+ // Add `LazyWrapper` methods to `lodash.prototype`.
+ baseForOwn(LazyWrapper.prototype, function(func, methodName) {
+ var checkIteratee = /^(?:filter|map|reject)|While$/.test(methodName),
+ retUnwrapped = /^(?:first|last)$/.test(methodName),
+ lodashFunc = lodash[retUnwrapped ? ('take' + (methodName == 'last' ? 'Right' : '')) : methodName];
+
+ if (!lodashFunc) {
+ return;
+ }
+ lodash.prototype[methodName] = function() {
+ var args = retUnwrapped ? [1] : arguments,
+ chainAll = this.__chain__,
+ value = this.__wrapped__,
+ isHybrid = !!this.__actions__.length,
+ isLazy = value instanceof LazyWrapper,
+ iteratee = args[0],
+ useLazy = isLazy || isArray(value);
+
+ if (useLazy && checkIteratee && typeof iteratee == 'function' && iteratee.length != 1) {
+ // Avoid lazy use if the iteratee has a "length" value other than `1`.
+ isLazy = useLazy = false;
+ }
+ var interceptor = function(value) {
+ return (retUnwrapped && chainAll)
+ ? lodashFunc(value, 1)[0]
+ : lodashFunc.apply(undefined, arrayPush([value], args));
+ };
+
+ var action = { 'func': thru, 'args': [interceptor], 'thisArg': undefined },
+ onlyLazy = isLazy && !isHybrid;
+
+ if (retUnwrapped && !chainAll) {
+ if (onlyLazy) {
+ value = value.clone();
+ value.__actions__.push(action);
+ return func.call(value);
+ }
+ return lodashFunc.call(undefined, this.value())[0];
+ }
+ if (!retUnwrapped && useLazy) {
+ value = onlyLazy ? value : new LazyWrapper(this);
+ var result = func.apply(value, args);
+ result.__actions__.push(action);
+ return new LodashWrapper(result, chainAll);
+ }
+ return this.thru(interceptor);
+ };
+ });
+
+ // Add `Array` and `String` methods to `lodash.prototype`.
+ arrayEach(['join', 'pop', 'push', 'replace', 'shift', 'sort', 'splice', 'split', 'unshift'], function(methodName) {
+ var func = (/^(?:replace|split)$/.test(methodName) ? stringProto : arrayProto)[methodName],
+ chainName = /^(?:push|sort|unshift)$/.test(methodName) ? 'tap' : 'thru',
+ retUnwrapped = /^(?:join|pop|replace|shift)$/.test(methodName);
+
+ lodash.prototype[methodName] = function() {
+ var args = arguments;
+ if (retUnwrapped && !this.__chain__) {
+ return func.apply(this.value(), args);
+ }
+ return this[chainName](function(value) {
+ return func.apply(value, args);
+ });
+ };
+ });
+
+ // Map minified function names to their real names.
+ baseForOwn(LazyWrapper.prototype, function(func, methodName) {
+ var lodashFunc = lodash[methodName];
+ if (lodashFunc) {
+ var key = lodashFunc.name,
+ names = realNames[key] || (realNames[key] = []);
+
+ names.push({ 'name': methodName, 'func': lodashFunc });
+ }
+ });
+
+ realNames[createHybridWrapper(undefined, BIND_KEY_FLAG).name] = [{ 'name': 'wrapper', 'func': undefined }];
+
+ // Add functions to the lazy wrapper.
+ LazyWrapper.prototype.clone = lazyClone;
+ LazyWrapper.prototype.reverse = lazyReverse;
+ LazyWrapper.prototype.value = lazyValue;
+
+ // Add chaining functions to the `lodash` wrapper.
+ lodash.prototype.chain = wrapperChain;
+ lodash.prototype.commit = wrapperCommit;
+ lodash.prototype.concat = wrapperConcat;
+ lodash.prototype.plant = wrapperPlant;
+ lodash.prototype.reverse = wrapperReverse;
+ lodash.prototype.toString = wrapperToString;
+ lodash.prototype.run = lodash.prototype.toJSON = lodash.prototype.valueOf = lodash.prototype.value = wrapperValue;
+
+ // Add function aliases to the `lodash` wrapper.
+ lodash.prototype.collect = lodash.prototype.map;
+ lodash.prototype.head = lodash.prototype.first;
+ lodash.prototype.select = lodash.prototype.filter;
+ lodash.prototype.tail = lodash.prototype.rest;
+
+ return lodash;
+ }
+
+ /*--------------------------------------------------------------------------*/
+
+ // Export lodash.
+ var _ = runInContext();
+
+ // Some AMD build optimizers like r.js check for condition patterns like the following:
+ if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
+ // Expose lodash to the global object when an AMD loader is present to avoid
+ // errors in cases where lodash is loaded by a script tag and not intended
+ // as an AMD module. See http://requirejs.org/docs/errors.html#mismatch for
+ // more details.
+ root._ = _;
+
+ // Define as an anonymous module so, through path mapping, it can be
+ // referenced as the "underscore" module.
+ define(function() {
+ return _;
+ });
+ }
+ // Check for `exports` after `define` in case a build optimizer adds an `exports` object.
+ else if (freeExports && freeModule) {
+ // Export for Node.js or RingoJS.
+ if (moduleExports) {
+ (freeModule.exports = _)._ = _;
+ }
+ // Export for Rhino with CommonJS support.
+ else {
+ freeExports._ = _;
+ }
+ }
+ else {
+ // Export for a browser or Rhino.
+ root._ = _;
+ }
+}.call(this));
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-17 15:01:06 +0000