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Which JavaScript frameworks/toolsets (jQuery vs Prototype vs Dojo....)?

There are some JavaScript frameworks/toolsets, such as:

•jQuery;
•Dojo;
•Prototype;
•YUI;
•MooTools;
•ExtJS;
•SmartClient;

Which one is easy to use?

jQuery 




	Fast

	Well documented

	Easy to use

	Chaining

	Unlike [Prototype](http://en.wikipedia.org/wiki/Prototype_JavaScript_Framework) it doesn't extend an object if you didn't specifically ask for it.

	easy-to-use Ajax

	Nice event handlers

	CSS selectors

	filtering your selection

	Small (only 30 KB)

	Nice little built-in effects.

	Plugins