'use strict'; var $ = require('../internals/export'); var $indexOf = require('../internals/array-includes').indexOf; var arrayMethodIsStrict = require('../internals/array-method-is-strict'); var arrayMethodUsesToLength = require('../internals/array-method-uses-to-length'); var nativeIndexOf = [].indexOf; var NEGATIVE_ZERO = !!nativeIndexOf && 1 / [1].indexOf(1, -0) < 0; var STRICT_METHOD = arrayMethodIsStrict('indexOf'); var USES_TO_LENGTH = arrayMethodUsesToLength('indexOf', { ACCESSORS: true, 1: 0 }); // `Array.prototype.indexOf` method // https://tc39.github.io/ecma262/#sec-array.prototype.indexof $({ target: 'Array', proto: true, forced: NEGATIVE_ZERO || !STRICT_METHOD || !USES_TO_LENGTH }, { indexOf: function indexOf(searchElement /* , fromIndex = 0 */) { return NEGATIVE_ZERO // convert -0 to +0 ? nativeIndexOf.apply(this, arguments) || 0 : $indexOf(this, searchElement, arguments.length > 1 ? arguments[1] : undefined); } });