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22 lines
964 B
22 lines
964 B
'use strict'; |
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var $export = require('./_export'); |
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var toIObject = require('./_to-iobject'); |
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var toInteger = require('./_to-integer'); |
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var toLength = require('./_to-length'); |
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var $native = [].lastIndexOf; |
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var NEGATIVE_ZERO = !!$native && 1 / [1].lastIndexOf(1, -0) < 0; |
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$export($export.P + $export.F * (NEGATIVE_ZERO || !require('./_strict-method')($native)), 'Array', { |
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// 22.1.3.14 / 15.4.4.15 Array.prototype.lastIndexOf(searchElement [, fromIndex]) |
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lastIndexOf: function lastIndexOf(searchElement /* , fromIndex = @[*-1] */) { |
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// convert -0 to +0 |
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if (NEGATIVE_ZERO) return $native.apply(this, arguments) || 0; |
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var O = toIObject(this); |
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var length = toLength(O.length); |
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var index = length - 1; |
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if (arguments.length > 1) index = Math.min(index, toInteger(arguments[1])); |
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if (index < 0) index = length + index; |
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for (;index >= 0; index--) if (index in O) if (O[index] === searchElement) return index || 0; |
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return -1; |
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} |
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});
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