1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
| "use strict";
|
| var toPosInt = require("../../number/to-pos-integer")
| , value = require("../../object/valid-value")
| , objHasOwnProperty = Object.prototype.hasOwnProperty;
|
| module.exports = function () {
| var i, length;
| if (!(length = toPosInt(value(this).length))) return null;
| i = 0;
| while (!objHasOwnProperty.call(this, i)) {
| if (++i === length) return null;
| }
| return i;
| };
|
|
