var toIndexedObject = require('../internals/to-indexed-object'); var toLength = require('../internals/to-length'); var toAbsoluteIndex = require('../internals/to-absolute-index'); // `Array.prototype.{ indexOf, includes }` methods implementation var createMethod = function (IS_INCLUDES) { return function ($this, el, fromIndex) { var O = toIndexedObject($this); var length = toLength(O.length); 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) };