Book Image

JavaScript Concurrency

By : Adam Boduch
Book Image

JavaScript Concurrency

By: Adam Boduch

Overview of this book

Concurrent programming may sound abstract and complex, but it helps to deliver a better user experience. With single threaded JavaScript, applications lack dynamism. This means that when JavaScript code is running, nothing else can happen. The DOM can’t update, which means the UI freezes. In a world where users expect speed and responsiveness – in all senses of the word – this is something no developer can afford. Fortunately, JavaScript has evolved to adopt concurrent capabilities – one of the reasons why it is still at the forefront of modern web development. This book helps you dive into concurrent JavaScript, and demonstrates how to apply its core principles and key techniques and tools to a range of complex development challenges. Built around the three core principles of concurrency – parallelism, synchronization, and conservation – you’ll learn everything you need to unlock a more efficient and dynamic JavaScript, to lay the foundations of even better user experiences. Throughout the book you’ll learn how to put these principles into action by using a range of development approaches. Covering everything from JavaScript promises, web workers, generators and functional programming techniques, everything you learn will have a real impact on the performance of your applications. You’ll also learn how to move between client and server, for a more frictionless and fully realized approach to development. With further guidance on concurrent programming with Node.js, JavaScript Concurrency is committed to making you a better web developer. The best developers know that great design is about more than the UI – with concurrency, you can be confident every your project will be expertly designed to guarantee its dynamism and power.
Table of Contents (17 chapters)
JavaScript Concurrency
About the Author
About the Reviewer

Evented network IO

NodeJS excels at serving HTTP requests. This is because a given request life-cycle spends much time in transit between the client and the server. During this time, Node processes other requests. In this section, we'll look at some of Node's HTTP networking capabilities, and how they fit into the IO event loop.

We'll start with a look at basic HTTP requests, and how they serve as the foundation for many Node modules and projects. Then, we'll move onto streaming responses to the client, instead of sending a giant blob of data all at once. Finally, we'll look at how Node servers can proxy requests to other services.

Handling HTTP requests

The http module in NodeJS takes care of all the nitty-gritty details with regard to creating and setting up HTTP servers. It should be no surprise that this module is heavily utilized by many Node projects that create web servers. It even has a helper function that will create the server for us, and setup the callback function that's used to...