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Reacting for the First Time

In the previous chapter, you started understanding the motivations behind using functional reactive programming in your systems; you also saw how a program using this paradigm fared against a program without it. You learned how reactive programming can improve code readability and testability by decoupling your event sources from the action you take when the action occurs.

We started with some basic examples using bacon.js as the reactive programming library for JavaScript. In the examples, we began with creating our first EventStream from an interval. Then we started using some operators (map() and take()). Finally, we subscribed to this event source to take actions in the case of an event occurrence. This was just a kind introduction to functional reactive programming.

When reading most of the functional reactive programming libraries (for any language), you will see a lot of diagrams...

Key benefits

Handle an infinite stream of incoming data using RxJs without going crazy

Explore important RxJs operators that can help you improve your code readability

Get acquainted with the different techniques and operators used to handle data traffic, which occurs when you receive data faster than you can process

Description

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.

What you will learn

Get to know the basics of functional reactive programming using RxJs

Process a continuous flow of data with linear memory consumption

Filter, group, and react to changes in your system

Discover how to deal with data traffic

Compose operators to create new operators and use them in multiple observables to avoid code repetition

Explore transducers and see how they can improve your code readability

Detect and recover from errors in observables using Retry and Catch operators

Create your own reactive application: a real-time webchat

What do you get with Print?

Instant access to your digital eBook copy whilst your Print order is Shipped

Paperback book shipped to your preferred address

Download this book in EPUB and PDF formats

Access this title in our online reader with advanced features

DRM FREE - Read whenever, wherever and however you want

Frequently bought together

React Design Patterns and Best Practices

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€32.99

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Total € 102.97

Yuri Oliveira Aug 21, 2017

As someone getting into Reactive Programming for the first time, the book is well paced and easy to read, with concrete examples, making it very easy to understand.

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Chetan Munegowda May 05, 2018

I highly recommend this book.

Martin Longbow Dec 03, 2017

Ill update when done reading, BUT WHY are you using rxjs 4.*, when rxjs 5 was available at the time of publish. You should have updated code examples. Its like writing a book on Angular 1.*, when 2.0 is already out. Aaarg.Update 1: I adjusted my rating down to 2 stars. Why? I'm running across a lot of rxjs 4 operators that are not in rxjs 5. So, I'm wondering should I skip this section, or not waste my time with the pages I am reading. I'm debating on whether to return this item or not.

Johannes Löwe Oct 28, 2017

This is a book for people just getting into RxJS and does not at all lead to mastering it. Considering the price, the amount of actual information in the book was disappointing.

Mastering Reactive JavaScript: Building asynchronous and high performing web apps with RxJS

What do you get with Print?

Mastering Reactive JavaScript

Reacting for the First Time

The bacon.js observables

Reacting to changes

Subscribing

Subscribing using the...

Reading how an operator works

Transforming events using bacon.js

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