This illustrates way better what is wrong with that piece of code: http://stackoverflow.com/a/500531/2570866 http://stackoverflow.com/a/500531/2570866 The spee

This illustrates way better what is wrong with that piece of code: http://stackoverflow.com/a/500531/2570866 http://stackoverflow.com/a/500531/2570866 The speed shouldn't be the issue. If it is, please start using a library like Lo-Dash [1], a faster version of Underscore.js. Actually, please just do that in general so you won't make mistakes like this. [1] http://lodash.com/ http://lodash.com/