git.r.bdr.sh - rbdr/dotfiles/blob

   1 'use strict';
   2
   3 var toPosInt = require('../../number/to-pos-integer')
   4   , value    = require('../../object/valid-value')
   5
   6   , hasOwnProperty = Object.prototype.hasOwnProperty;
   7
   8 module.exports = function () {
   9         var i, l;
  10         if (!(l = toPosInt(value(this).length))) return null;
  11         i = l - 1;
  12         while (!hasOwnProperty.call(this, i)) {
  13                 if (--i === -1) return null;
  14         }
  15         return i;
  16 };