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- 'use strict';
- /* eslint-disable es/no-array-prototype-lastindexof -- safe */
- var apply = require('../internals/function-apply');
- var toIndexedObject = require('../internals/to-indexed-object');
- var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
- var lengthOfArrayLike = require('../internals/length-of-array-like');
- var arrayMethodIsStrict = require('../internals/array-method-is-strict');
-
- var min = Math.min;
- var $lastIndexOf = [].lastIndexOf;
- var NEGATIVE_ZERO = !!$lastIndexOf && 1 / [1].lastIndexOf(1, -0) < 0;
- var STRICT_METHOD = arrayMethodIsStrict('lastIndexOf');
- var FORCED = NEGATIVE_ZERO || !STRICT_METHOD;
-
- // `Array.prototype.lastIndexOf` method implementation
- // https://tc39.es/ecma262/#sec-array.prototype.lastindexof
- module.exports = FORCED ? function lastIndexOf(searchElement /* , fromIndex = @[*-1] */) {
- // convert -0 to +0
- if (NEGATIVE_ZERO) return apply($lastIndexOf, this, arguments) || 0;
- var O = toIndexedObject(this);
- var length = lengthOfArrayLike(O);
- if (length === 0) return -1;
- var index = length - 1;
- if (arguments.length > 1) index = min(index, toIntegerOrInfinity(arguments[1]));
- if (index < 0) index = length + index;
- for (;index >= 0; index--) if (index in O && O[index] === searchElement) return index || 0;
- return -1;
- } : $lastIndexOf;
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