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With brief mentions interspersed throughout the book, the author also managed to give an overview of the libraries and tools in the current JavaScript ecosystem, without really favoring any of them. At the very end a couple of words are dedicated to the broader topic of dependency injection, aspect-oriented programming and macros, each one of them deserving a book of its own. Most of them are even accompanied by interesting examples from the lively world of A Song of Ice and Fire. Each and every design pattern is introduced in a broader context, with a discussion of its advantages and drawbacks.

The reading gets even more interesting in the second part, which moves on to the more recent design patterns, grouped into different fields of interest: functional programming, automated testing, user interface, web and messaging.

The first part is dedicated to the well known patterns from the classical "Gang of Four" book, but instead of just rehashing its contents, the author takes a different approach and reevaluates the meaning of the same design patterns in a dynamic language like JavaScript in contrast to the object oriented languages from the original book. The title makes it clear that the majority of the book is focusing on software design patterns. This serves as a great way to make the book easier to follow even for those with less experience in JavaScript. From a brief history of this controversial language it quickly dives into its most important specifics which tend to elude the developers coming from other languages such as Java or C#. It does a great job at introducing JavaScript as a language from all aspects.

I was really glad to see that it's actually more than just a book about design patterns. Now that I finished the book, I don't regret my decision even a little, the author did a great job and this well written book exceeded my expectations. In the latest batch of new books from Packt Publishing, Mastering JavaScript Design Patterns by Simon Timms attracted my attention the most and as such warranted my review.