Introduction

Callbacks are the low-level building blocks of asynchronous programming in Node.js, but they’re far from being developer-friendly. In fact, in the last chapter, we learned techniques to implement different control flow constructs using callbacks, and we can say that they’re really complex and verbose compared to the (low) level of complexity of the tasks they try to accomplish. In particular, serial execution flow, which is the predominant control flow structure in most of the code we write, can easily ...