2 var $ = require('../internals/export');
3 var $indexOf = require('../internals/array-includes').indexOf;
4 var arrayMethodIsStrict = require('../internals/array-method-is-strict');
5 var arrayMethodUsesToLength = require('../internals/array-method-uses-to-length');
7 var nativeIndexOf = [].indexOf;
9 var NEGATIVE_ZERO = !!nativeIndexOf && 1 / [1].indexOf(1, -0) < 0;
10 var STRICT_METHOD = arrayMethodIsStrict('indexOf');
11 var USES_TO_LENGTH = arrayMethodUsesToLength('indexOf', { ACCESSORS: true, 1: 0 });
13 // `Array.prototype.indexOf` method
14 // https://tc39.github.io/ecma262/#sec-array.prototype.indexof
15 $({ target: 'Array', proto: true, forced: NEGATIVE_ZERO || !STRICT_METHOD || !USES_TO_LENGTH }, {
16 indexOf: function indexOf(searchElement /* , fromIndex = 0 */) {
19 ? nativeIndexOf.apply(this, arguments) || 0
20 : $indexOf(this, searchElement, arguments.length > 1 ? arguments[1] : undefined);