1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
/**
* lodash 3.6.1 (Custom Build) <https://lodash.com/>
* Build: `lodash modern modularize exports="npm" -o ./`
* 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>
*/
/** Used as the `TypeError` message for "Functions" methods. */
var FUNC_ERROR_TEXT = 'Expected a function';
/* Native method references for those with the same name as other `lodash` methods. */
var nativeMax = Math.max;
/**
* 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);
};
}
module.exports = restParam;
|
