In this chapter, you learned about common JavaScript coding patterns and learned how to make your programs cleaner, faster, and better at working with other programs and libraries. Then, you saw a discussion and sample implementations of a handful of the design patterns from the Book of Four. You can see how JavaScript is a fully featured dynamic programming language, and that implementing classical patterns in a dynamic loosely typed language is pretty easy. The patterns are, in general, a large topic, and you can join the author of this book in a further discussion of the JavaScript patterns at JSPatterns.com, or take a look at the JavaScript Patterns book. The next chapter focuses on testing and debugging methodologies.