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
About the Authors
About the Author
About the Reviewers

Fundamentals of cross-platform development

When developing for different platforms, the most common problem we have to face is sharing the common parts of a component while providing different implementations for details that are platform-specific. We will now explore some of the principles and the patterns to use when facing this challenge.

Runtime code branching

The most simple and intuitive technique for providing different implementations based on the host platform is to dynamically branch our code. This requires that we have a mechanism to recognize at runtime the host platform and then switch dynamically the implementation with an if…else statement. Some generic approaches involve checking global variables that are available only on Node.js or only in the browser. For example, we can check the existence of the window global:

if(typeof window !== "undefined" && window.document) { 
  //client side code 
  console.log('Hey browser!'); 
} else { 
  //Node.js code...