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)

The web chat server

To show the use of functional reactive programming and RxJS in JavaScript projects we will implement a web chat server. This is a perfect choice, because of the nature of this application.

In web chats users are constantly sending and receiving message; on some implementations of chat servers you can even send commands to remove or block a user, set reminders, and other things right from the text box. So, it is really easy to see how messages can be modeled as data being propagated through an observable sequence and how it is important to distinguish messages coming from this channel (commands from user messages).

There is also the possibility of implementing this server using WebSocket, which will also show us how RxJS is a perfect fit for any application using WebSockets.

Last but not least, it is important to notice that a web chat application can be easy to implement, but it can become arbitrarily complex as you decide to create new features for it.

For our web chat application...