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25 lines
903 B
25 lines
903 B
'use strict'; |
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var aFunction = require('./_a-function'); |
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var isObject = require('./_is-object'); |
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var invoke = require('./_invoke'); |
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var arraySlice = [].slice; |
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var factories = {}; |
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var construct = function (F, len, args) { |
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if (!(len in factories)) { |
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for (var n = [], i = 0; i < len; i++) n[i] = 'a[' + i + ']'; |
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// eslint-disable-next-line no-new-func |
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factories[len] = Function('F,a', 'return new F(' + n.join(',') + ')'); |
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} return factories[len](F, args); |
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}; |
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module.exports = Function.bind || function bind(that /* , ...args */) { |
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var fn = aFunction(this); |
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var partArgs = arraySlice.call(arguments, 1); |
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var bound = function (/* args... */) { |
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var args = partArgs.concat(arraySlice.call(arguments)); |
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return this instanceof bound ? construct(fn, args.length, args) : invoke(fn, args, that); |
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}; |
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if (isObject(fn.prototype)) bound.prototype = fn.prototype; |
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return bound; |
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};
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