| 'use strict'; |
| |
| var toPosInt = require('../../number/to-pos-integer') |
| , value = require('../../object/valid-value') |
| |
| , lastIndexOf = Array.prototype.lastIndexOf |
| , hasOwnProperty = Object.prototype.hasOwnProperty |
| , abs = Math.abs, floor = Math.floor; |
| |
| module.exports = function (searchElement/*, fromIndex*/) { |
| var i, fromIndex, val; |
| if (searchElement === searchElement) { //jslint: ignore |
| return lastIndexOf.apply(this, arguments); |
| } |
| |
| value(this); |
| fromIndex = arguments[1]; |
| if (isNaN(fromIndex)) fromIndex = (toPosInt(this.length) - 1); |
| else if (fromIndex >= 0) fromIndex = floor(fromIndex); |
| else fromIndex = toPosInt(this.length) - floor(abs(fromIndex)); |
| |
| for (i = fromIndex; i >= 0; --i) { |
| if (hasOwnProperty.call(this, i)) { |
| val = this[i]; |
| if (val !== val) return i; //jslint: ignore |
| } |
| } |
| return -1; |
| }; |
