Javascript Namespacing. Does it increase JS/Browser performance?

SO i totally understand why we should namespace in javascript, but is it mainly for organizational purpose开发者_Python百科s and to keep the global namespace uncluttered?. Does namepacing actually help in performance of the browser/JS engine. Just wondering what your thoughts were. Thanks

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It technically hinders performance but not much, depending on how deep you start going. Silobox (http://www.silobox.com/) is a JavaScript performance benchmarking tool and we wrote a test that tests this very thing. We found that the deeper an object was nested, the longer accessing those properties took.

So for optimum speed, I recommend adding global shortcut functions to your code.

Assume you have:

var mycompany.myproj.Something = function(){ ... };

It's good practice to include

var MCSomething = mycompany.myproj.Something;

That way, when the JS engine looks up MCSomething, it doesn't have to climb down any trees. Google Maps uses this approach.

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There shouldn't be any noticeable affect on performance from using namespaces. The primary reasons are just what you mentioned: keeping the global namespace clean (to avoid naming conflicts) and organization.