一个以上的javascript名称空间？

Question

I was wondering whether there is any associated performance problems with using only one namespace or whether assigning more than one is better ?

By this I mean

(function (myApp, $, undefined) {

} (window.myApp = window.myApp || {}, jQuery));

And assign every function / object / property to the myApp namespace or whether it is more efficent from a performance perspective to have myApp for common functions etc and then have

(function (myAppSettings, $, undefined) {

} (window.myAppSettings = window.myAppSettings || {}, jQuery));

And so forth ?

Edit : to clarify the generic settings to myAppSettings per @pimvdb very correct comment

Answer 1

Generally a shallow tree is better than a deep tree (citation from here ). So, depending on the circumstances, it may be better to use more than one namespace. The cited article claims a single namespace is negligible in terms of perfomance though.

Answer 2

I don't think there is any difference from a performance point of view. Getting an object property is O(1) in today's implementations.

But a name like settings is so generic you'd better not make it collide with another library's settings . Since these settings are part of myApp , it makes most sense (and it is most safest) to put it in the myApp object.

If every library would be setting window.settings , that would be a big issue.