1 var toIndexedObject = require('../internals/to-indexed-object');
2 var toAbsoluteIndex = require('../internals/to-absolute-index');
3 var lengthOfArrayLike = require('../internals/length-of-array-like');
5 // `Array.prototype.{ indexOf, includes }` methods implementation
6 var createMethod = function (IS_INCLUDES) {
7 return function ($this, el, fromIndex) {
8 var O = toIndexedObject($this);
9 var length = lengthOfArrayLike(O);
10 var index = toAbsoluteIndex(fromIndex, length);
12 // Array#includes uses SameValueZero equality algorithm
13 // eslint-disable-next-line no-self-compare -- NaN check
14 if (IS_INCLUDES && el != el) while (length > index) {
16 // eslint-disable-next-line no-self-compare -- NaN check
17 if (value != value) return true;
18 // Array#indexOf ignores holes, Array#includes - not
19 } else for (;length > index; index++) {
20 if ((IS_INCLUDES || index in O) && O[index] === el) return IS_INCLUDES || index || 0;
21 } return !IS_INCLUDES && -1;
26 // `Array.prototype.includes` method
27 // https://tc39.es/ecma262/#sec-array.prototype.includes
28 includes: createMethod(true),
29 // `Array.prototype.indexOf` method
30 // https://tc39.es/ecma262/#sec-array.prototype.indexof
31 indexOf: createMethod(false)