Book Image

Mastering Reactive JavaScript

By : Erich de Souza Oliveira
Book Image

Mastering Reactive JavaScript

By: Erich de Souza Oliveira

Overview of this book

If you’re struggling to handle a large amount of data and don’t know how to improve your code readability, then reactive programming is the right solution for you. It lets you describe how your code behaves when changes happen and makes it easier to deal with real-time data. This book will teach you what reactive programming is, and how you can use it to write better applications. The book starts with the basics of reactive programming, what Reactive Extensions is, and how can you use it in JavaScript along with some reactive code using Bacon. Next, you’ll discover what an Observable and an Observer are and when to use them.You'll also find out how you can query data through operators, and how to use schedulers to react to changes. Moving on, you’ll explore the RxJs API, be introduced to the problem of data traffic (backpressure), and see how you can mitigate it. You’ll also learn about other important operators that can help improve your code readability, and you’ll see how to use transducers to compose operators. At the end of the book, you’ll get hands-on experience of using RxJs, and will create a real-time web chat using RxJs on the client and server, providing you with the complete package to master RxJs.
Table of Contents (11 chapters)

Why do I need it?

Functional reactive programming is especially useful when implementing one of these scenarios:

  • Graphical user interface
  • Animation
  • Robotics
  • Simulation
  • Computer vision

A few years ago, all a user could do in a web app was fill a form with some data and post it to a server. Nowadays our web apps and mobile apps present to the user a richer interface, empowering them with real-time information and giving a lot more interaction possibilities. So, as the applications evolved, we needed more tools to achieve the new requirements.

Using it you can abstract the source of your data to the business logic of your application–this lets you write more concise and decoupled code, improves the reuse, and leads to a more testable code as you can easily mock your streams to test your business logic.

In this book we will use Reactive Extensions to explain and implement an example reactive application. Reactive Extensions are widely used in the industry and they have implementations for different languages (.Net, Scala, JavaScript, Ruby, Java, and so on) so you can easily translate the things you learn in this book to other languages.

In my personal opinion, Reactive Extensions have some concepts which are hard to understand for those unfamiliar with reactive programming. For this reason, we will learn the basics using a more simple library (bacon.js), and as soon as you understand the basics and the concepts, I will give you more tools using RxJS.