array-includes.js
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array-includes.js
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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)
	};