JavaScript with Promises

Preface

Asynchronous JavaScript is everywhere. AJAX, WebRTC, and Node.js are a few examples of where asynchronous APIs are found. Although it is easy to write a quick function to handle the result of one HTTP request, it is also easy to get lost in an unpredictable sea of callbacks as a codebase grows and more people contribute. That’s where a good approach for handling asynchronous code comes in and many developers are choosing to use Promises in their approach.

This is the book I needed when originally choosing an asynchronous strategy, and it is the result of my experience using promises in JavaScript applications. It explains their use and inner workings while exposing difficulties and missteps. Promises are made up of only a few concepts with a small API. But in the same way that JavaScript’s small number of simple constructs are used to create elegant and powerful solutions, I am surprised and pleased at the number of ways Promises can be used to effectively manage asynchronous code.

Intended Audience

This book is for intermediate and advanced JavaScript developers who want to write asynchronous code. These developers may be comfortable with JavaScript for traditional web APIs but are moving to environments such as Node.js, Google Chrome packaged apps, or building desktop applications with JavaScript. Developers who write browser-based code and want to use frameworks such as Angular or newer browser technologies such as Service Workers or WebRTC will also benefit. Even ...