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/** Used for native method references. */
var objectProto = Object.prototype;
/** Used to detect DOM support. */
var document = (document = global.window) && document.document;
/** Native method references. */
var propertyIsEnumerable = objectProto.propertyIsEnumerable;
/**
* An object environment feature flags.
*
* @static
* @memberOf _
* @type Object
*/
var support = {};
(function(x) {
var Ctor = function() { this.x = x; },
args = arguments,
object = { '0': x, 'length': x },
props = [];
Ctor.prototype = { 'valueOf': x, 'y': x };
for (var key in new Ctor) { props.push(key); }
/**
* Detect if functions can be decompiled by `Function#toString`
* (all but Firefox OS certified apps, older Opera mobile browsers, and
* the PlayStation 3; forced `false` for Windows 8 apps).
*
* @memberOf _.support
* @type boolean
*/
support.funcDecomp = /\bthis\b/.test(function() { return this; });
/**
* Detect if `Function#name` is supported (all but IE).
*
* @memberOf _.support
* @type boolean
*/
support.funcNames = typeof Function.name == 'string';
/**
* Detect if the DOM is supported.
*
* @memberOf _.support
* @type boolean
*/
try {
support.dom = document.createDocumentFragment().nodeType === 11;
} catch(e) {
support.dom = false;
}
/**
* Detect if `arguments` object indexes are non-enumerable.
*
* In Firefox < 4, IE < 9, PhantomJS, and Safari < 5.1 `arguments` object
* indexes are non-enumerable. Chrome < 25 and Node.js < 0.11.0 treat
* `arguments` object indexes as non-enumerable and fail `hasOwnProperty`
* checks for indexes that exceed the number of function parameters and
* whose associated argument values are `0`.
*
* @memberOf _.support
* @type boolean
*/
try {
support.nonEnumArgs = !propertyIsEnumerable.call(args, 1);
} catch(e) {
support.nonEnumArgs = true;
}
}(1, 0));
module.exports = support;
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