Summary
In this chapter, we made our first contact with the practical aspects of writing asynchronous code. You discovered the two pillars of the entire Node.js asynchronous infrastructure—the callback and the EventEmitter—and we explored in detail their use cases, conventions, and patterns. We also explored some of the pitfalls of dealing with asynchronous code and you learned about the ways to avoid them. Mastering the content of this chapter paves the way toward learning the more advanced asynchronous techniques that will be presented throughout the rest of this book.
In the next chapter, you will learn how to deal with complex asynchronous control flows using callbacks.