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joshnesbitt/window.js

Created November 29, 2011 15:54
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window.js
(function(window) {
// stuff that uses window a lot here...
})(window);
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joshnesbitt commented Nov 29, 2011

In this instance, assume you are operating inside a closure, and that there is a lot of code in the anonymous function that accesses the window property.

If the window property was not passed into the local scope, every time window was accessed it would have to traverse up to the top level scope to find the actual window object. By passing it into the local scope we save any further lookups other than the current scope, reducing more intensive lookups to the top level scope.

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