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- var toIndexedObject = require('../internals/to-indexed-object');
- var toAbsoluteIndex = require('../internals/to-absolute-index');
- var lengthOfArrayLike = require('../internals/length-of-array-like');
- // `Array.prototype.{ indexOf, includes }` methods implementation
- var createMethod = function (IS_INCLUDES) {
- return function ($this, el, fromIndex) {
- var O = toIndexedObject($this);
- var length = lengthOfArrayLike(O);
- var index = toAbsoluteIndex(fromIndex, length);
- var value;
- // Array#includes uses SameValueZero equality algorithm
- // eslint-disable-next-line no-self-compare -- NaN check
- if (IS_INCLUDES && el != el) while (length > index) {
- value = O[index++];
- // eslint-disable-next-line no-self-compare -- NaN check
- if (value != value) return true;
- // Array#indexOf ignores holes, Array#includes - not
- } else for (;length > index; index++) {
- if ((IS_INCLUDES || index in O) && O[index] === el) return IS_INCLUDES || index || 0;
- } return !IS_INCLUDES && -1;
- };
- };
- module.exports = {
- // `Array.prototype.includes` method
- // https://tc39.es/ecma262/#sec-array.prototype.includes
- includes: createMethod(true),
- // `Array.prototype.indexOf` method
- // https://tc39.es/ecma262/#sec-array.prototype.indexof
- indexOf: createMethod(false)
- };
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