Comments on: Lazy definition function

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By: Gendelf

Gendelf — Wed, 10 Nov 2010 11:45:03 +0000

Function is a function. It should be used to do or calculate something. To store result we have variables

By: Rob

Rob — Mon, 19 Apr 2010 21:59:53 +0000

This pattern can be useful when dealing with cross-browser code. For instance, getting the XmlHttpRequest() object. You could wrap the code for searching the correct object in the initial code and return the caching of the final object. Like this for instance:

ns.getXHRObject = function() {

if (typeof(window.XMLHttpRequest) === “function”) {
// Native object exists
ns.getXHRObject = function() {
return new window.XMLHttpRequest();
};
}
else {
// Do your older browser searching here and replace the outcome with
// a similar new function definition as above..
}
};

Next time the function is called, the caching is returned. So execution will be faster the
second time.. imagine doing this for functions which will do lots of logic over and over again with the same outcome.. this can save lots of cpu cycles.. and better yet, improve user experience..

By: Yaroslav

Yaroslav — Mon, 29 Mar 2010 10:57:43 +0000

What is the difference between lazy definition functions and closures? They looks too similar.

By: ????? » Blog Archive » Lazy Function Definition

????? » Blog Archive » Lazy Function Definition — Thu, 18 Mar 2010 14:41:24 +0000

[...] http://www.jspatterns.com/lazy-definition-function/ [...]

By: nghia

nghia — Mon, 18 Jan 2010 14:27:46 +0000

Hi Stoyan Stefanov
please answer me a question : What is Lazy definition function used for? and when we use it ?