Book Image

PHP Reactive Programming

By : Martin Sikora
Book Image

PHP Reactive Programming

By: Martin Sikora

Overview of this book

Reactive Programming helps us write code that is concise, clear, and readable. Combining the power of reactive programming and PHP, one of the most widely used languages, will enable you to create web applications more pragmatically. PHP Reactive Programming will teach you the benefits of reactive programming via real-world examples with a hands-on approach. You will create multiple projects showing RxPHP in action alone and in combination with other libraries. The book starts with a brief introduction to reactive programming, clearly explaining the importance of building reactive applications. You will use the RxPHP library, built a reddit CLI using it, and also re-implement the Symfony3 Event Dispatcher with RxPHP. You will learn how to test your RxPHP code by writing unit tests. Moving on to more interesting aspects, you will implement a web socket backend by developing a browser game. You will learn to implement quite complex reactive systems while avoiding pitfalls such as circular dependencies by moving the RxJS logic from the frontend to the backend. The book will then focus on writing extendable RxPHP code by developing a code testing tool and also cover Using RxPHP on both the server and client side of the application. With a concluding chapter on reactive programming practices in other languages, this book will serve as a complete guide for you to start writing reactive applications in PHP.
Table of Contents (18 chapters)
PHP Reactive Programming
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

A quick introduction to RxJS 5 in Node.js


We're already pretty experienced reactive developers, so none of these examples should surprise us.

We'll start by installing RxJS 5 via npm (basically, a dependency management tool similar to Composer in PHP):

$ npm install rxjs

As we said earlier, we're going to use ES6 syntax, but we want to avoid recompiling our code because of ES6 imports. That's why we'll always use the require() function to load dependencies. This example should be very simple:

// rxjs_01.js 
const Rx = require('rxjs/Rx'); 
 
Rx.Observable.range(1, 8) 
    .filter(val => val % 2 == 0) 
    .subscribe(val => console.log('Next:', val)); 

We loaded RxJS 5 with rxjs/Rx under the Rx constant. Node.js knows where to find the rxjs package (it automatically looks for packages into the node_modules directory). The full name rxjs/Rx means that it'll load file from ./node_modules/rxjs/Rx.js. It is like the entry point of this library. It contains a lot of require() calls and then...