2 var $export = require('./_export')
3 , toIObject = require('./_to-iobject')
4 , toInteger = require('./_to-integer')
5 , toLength = require('./_to-length')
6 , $native = [].lastIndexOf
7 , NEGATIVE_ZERO = !!$native && 1 / [1].lastIndexOf(1, -0) < 0;
9 $export($export.P + $export.F * (NEGATIVE_ZERO || !require('./_strict-method')($native)), 'Array', {
10 // 22.1.3.14 / 15.4.4.15 Array.prototype.lastIndexOf(searchElement [, fromIndex])
11 lastIndexOf: function lastIndexOf(searchElement /*, fromIndex = @[*-1] */){
13 if(NEGATIVE_ZERO)return $native.apply(this, arguments) || 0;
14 var O = toIObject(this)
15 , length = toLength(O.length)
17 if(arguments.length > 1)index = Math.min(index, toInteger(arguments[1]));
18 if(index < 0)index = length + index;
19 for(;index >= 0; index--)if(index in O)if(O[index] === searchElement)return index || 0;