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Editorial Team
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Asked: 2026-06-03T15:23:00+00:00

I know that it’s a good idea to cache objects that will be used

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I know that it’s a good idea to cache objects that will be used many times. But what about if I will use the following many times:

var chacheWindow = window;
var chacheDocument = document;
var chacheNavigator = navigator;
var chacheScreen = screen;
var chacheWindowLocationHash = window.location.hash;
var chacheDocumentBody = document.body;

Maybe it is only good to chace stuff between <html></html>? Please explain.

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1 Answer

  1. Editorial Team

    The point of caching is to avoid either:

    Typing long names repeatedly

    Every one of your examples has a longer name then the original so you don’t get that benefit

    Avoiding making an expensive operation repeatedly (or a slightly costly operation, e.g. array.length before a for loop, a very large number of times)

    There is no sign that you are getting that benefit either.

    You probably shouldn’t be copying the references to local variables at all.

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