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