'use strict'; | |
var $export = require('./_export') | |
, toIObject = require('./_to-iobject') | |
, toInteger = require('./_to-integer') | |
, toLength = require('./_to-length') | |
, $native = [].lastIndexOf | |
, NEGATIVE_ZERO = !!$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) | |
, length = toLength(O.length) | |
, 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; | |
} | |
}); |