“Learning JavaScript Design Patterns” is a free eBook (also available in print via O’Reilly Media) by Addy Osmani which explains how to apply various design patterns to JavaScript.
It’s not only a great resource to improve your JavaScript skills or an easily understandable refresher of design patterns (if you didn’t understand the C/C++ or Java versions, this is the place to go!).
It also lists some of the latest patterns that you might have missed like the MVVM pattern.
Last but not least, it can serve as a test for huge HTML pages 😉
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