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