Last change
on this file since 6a80231 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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File size:
1.1 KB
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[6a3a178] | 1 | 'use strict';
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| 2 | var aFunction = require('../internals/a-function');
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| 3 | var isObject = require('../internals/is-object');
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| 4 |
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| 5 | var slice = [].slice;
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| 6 | var factories = {};
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| 7 |
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| 8 | var construct = function (C, argsLength, args) {
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| 9 | if (!(argsLength in factories)) {
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| 10 | for (var list = [], i = 0; i < argsLength; i++) list[i] = 'a[' + i + ']';
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| 11 | // eslint-disable-next-line no-new-func -- we have no proper alternatives, IE8- only
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| 12 | factories[argsLength] = Function('C,a', 'return new C(' + list.join(',') + ')');
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| 13 | } return factories[argsLength](C, args);
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| 14 | };
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| 15 |
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| 16 | // `Function.prototype.bind` method implementation
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| 17 | // https://tc39.es/ecma262/#sec-function.prototype.bind
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| 18 | module.exports = Function.bind || function bind(that /* , ...args */) {
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| 19 | var fn = aFunction(this);
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| 20 | var partArgs = slice.call(arguments, 1);
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| 21 | var boundFunction = function bound(/* args... */) {
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| 22 | var args = partArgs.concat(slice.call(arguments));
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| 23 | return this instanceof boundFunction ? construct(fn, args.length, args) : fn.apply(that, args);
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| 24 | };
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| 25 | if (isObject(fn.prototype)) boundFunction.prototype = fn.prototype;
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| 26 | return boundFunction;
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| 27 | };
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