Tim van der Lippe | fdbd42e | 2020-04-07 15:14:36 +0100 | [diff] [blame^] | 1 | 'use strict'; |
| 2 | |
| 3 | var ToInteger = require('es-abstract/2018/ToInteger'); |
| 4 | var ToLength = require('es-abstract/2018/ToLength'); |
| 5 | var ToObject = require('es-abstract/2018/ToObject'); |
| 6 | var SameValueZero = require('es-abstract/2018/SameValueZero'); |
| 7 | var $isNaN = require('es-abstract/helpers/isNaN'); |
| 8 | var $isFinite = require('es-abstract/helpers/isFinite'); |
| 9 | var GetIntrinsic = require('es-abstract/GetIntrinsic'); |
| 10 | var callBound = require('es-abstract/helpers/callBound'); |
| 11 | var isString = require('is-string'); |
| 12 | |
| 13 | var $charAt = callBound('String.prototype.charAt'); |
| 14 | var $indexOf = GetIntrinsic('%Array.prototype.indexOf%'); // TODO: use callBind.apply without breaking IE 8 |
| 15 | |
| 16 | module.exports = function includes(searchElement) { |
| 17 | var fromIndex = arguments.length > 1 ? ToInteger(arguments[1]) : 0; |
| 18 | if ($indexOf && !$isNaN(searchElement) && $isFinite(fromIndex) && typeof searchElement !== 'undefined') { |
| 19 | return $indexOf.apply(this, arguments) > -1; |
| 20 | } |
| 21 | |
| 22 | var O = ToObject(this); |
| 23 | var length = ToLength(O.length); |
| 24 | if (length === 0) { |
| 25 | return false; |
| 26 | } |
| 27 | var k = fromIndex >= 0 ? fromIndex : Math.max(0, length + fromIndex); |
| 28 | while (k < length) { |
| 29 | if (SameValueZero(searchElement, isString(O) ? $charAt(O, k) : O[k])) { |
| 30 | return true; |
| 31 | } |
| 32 | k += 1; |
| 33 | } |
| 34 | return false; |
| 35 | }; |