| "use strict"; |
| |
| var numberIsNaN = require("../../number/is-nan") |
| , toPosInt = require("../../number/to-pos-integer") |
| , value = require("../../object/valid-value") |
| , lastIndexOf = Array.prototype.lastIndexOf |
| , objHasOwnProperty = Object.prototype.hasOwnProperty |
| , abs = Math.abs |
| , floor = Math.floor; |
| |
| module.exports = function (searchElement /*, fromIndex*/) { |
| var i, fromIndex, val; |
| if (!numberIsNaN(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 (objHasOwnProperty.call(this, i)) { |
| val = this[i]; |
| if (numberIsNaN(val)) return i; // Jslint: ignore |
| } |
| } |
| return -1; |
| }; |
