jQuery is by far the most widely used library for JavaScript. It is used on more than 50% of websites. Many frameworks, such as Backbone and Twitters Bootstrap, are built on top of jQuery. Being able to extend and write plugins for jQuery can not only save lots of time, but also makes code much cleaner and easier to maintain.
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About Robert Duchnik, jQuery Plugin Development In 30 Minutes
Robert Duchnik, jQuery Plugin Development In 30 Minutes.