Book Image

Node.js Design Patterns - Second Edition

By : Luciano Mammino, Purra, Mario Casciaro
Book Image

Node.js Design Patterns - Second Edition

By: Luciano Mammino, Purra, 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 (12 chapters)

Async await using Babel

Callbacks, promises, and generators turn out to be the weapons at our disposal to deal with asynchronous code in JavaScript and in Node.js. As we have seen, generators are very interesting because they offer a way to actually suspend the execution of a function and resume it at a later stage. Now we can adopt this feature to write asynchronous code that allows developers to write functions that "appear" to block at each asynchronous operation, waiting for the results before continuing with the following statement.

The problem is that generator functions are designed to deal mostly with iterators and their usage with asynchronous code feels a bit cumbersome. It might be hard to understand, leading to code that is hard to read and maintain.

But there is hope that there will be a cleaner syntax sometime in the near future. In fact, there is an interesting proposal that will be introduced with the ECMAScript 2017 specification that defines the async function...