Book Image

Node.js Design Patterns - Second Edition

By : Joel Purra, Luciano Mammino, Mario Casciaro
Book Image

Node.js Design Patterns - Second Edition

By: Joel Purra, Luciano Mammino, Mario Casciaro

Overview of this book

Node.js is a massively popular software platform that lets you use JavaScript to easily create scalable server-side applications. It allows you to create efficient code, enabling a more sustainable way of writing software made of only one language across the full stack, along with extreme levels of reusability, pragmatism, simplicity, and collaboration. Node.js is revolutionizing the web and the way people and companies create their software. In this book, we will take you on a journey across various ideas and components, and the challenges you would commonly encounter while designing and developing software using the Node.js platform. You will also discover the "Node.js way" of dealing with design and coding decisions. The book kicks off by exploring the basics of Node.js describing it's asynchronous single-threaded architecture and the main design patterns. It then shows you how to master the asynchronous control flow patterns,and the stream component and it culminates into a detailed list of Node.js implementations of the most common design patterns as well as some specific design patterns that are exclusive to the Node.js world.Lastly, it dives into more advanced concepts such as Universal Javascript, and scalability' and it's meant to conclude the journey by giving the reader all the necessary concepts to be able to build an enterprise grade application using Node.js.
Table of Contents (20 chapters)
Node.js Design Patterns - Second Edition
Credits
About the Authors
Acknowledgments
About the Author
Acknowledgments
About the Reviewers
www.PacktPub.com
Preface

Chapter 4. Asynchronous Control Flow Patterns with ES2015 and Beyond

In the previous chapter, we learned how to deal with asynchronous code using callbacks and how they can have a bad impact on our code, generating issues such as callback hell. Callbacks are the building blocks of asynchronous programming in JavaScript and in Node.js, but over the years, other alternatives have emerged. Those alternatives are more sophisticated in order to be able to deal with asynchronous code in ways that are more convenient.

In this chapter, we are going to explore some of the most famous alternatives, promises and generators. We will also explore async await, an innovative syntax that will be available in JavaScript as part of the release of ECMAScript 2017.

We will see how these alternatives can simplify the way we deal with asynchronous control flows. Finally, we will compare all these approaches in order to understand all the pros and cons of each of them and be able to wisely choose the approach that...