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Reactive Programming with RxJS: Untangle Your Asynchronous JavaScript Code, by Sergi Mansilla
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Reactive programming is revolutionary. It makes asynchronous programming cleaner, intuitive, and robust. Discover how to use the RxJS library to write programs in a simpler way, unifying asynchronous mechanisms such as callbacks and promises into a single, powerful construct. Learn to think about your programs as streams of data that you can transform by expressing what should happen, instead of having to painstakingly program how it should happen. You'll be able to handle real-world concurrency and write complex flows of events in your applications with ease.
Create highly concurrent applications while writing simpler code using the Reactive Extensions for JavaScript (RxJS), a set of libraries for event composition. Programming real-world applications in JavaScript involves lots of asynchronous events--you might end up spending more time coordinating asynchronous code in your program than writing its actual functionality. This book introduces concepts and tools from reactive programming that will help you write cleaner and more robust asynchronous programs.
Find out about Observable sequences, a unifying data type to write highly concurrent code. Discover Schedulers and change the concept of time in your applications, making asynchronous testing sane again. Along the way you'll see real-world examples for the browser and Node.js, including a real-time earthquake visualization in 20 lines of code and a frantic shoot-'em-up space videogame. You'll also use Cycle.js - a modern, fully reactive web framework - to make a whole new breed of web applications.
By the end of the book, you'll know how to apply reactive programming to solve complex problems, build efficient programs with reactive user interfaces, and write your code more declaratively.
What You Need:
A modern web browser, Node.JS installed in your computer, and the RxJS JavaScript library.
- Sales Rank: #106465 in Books
- Published on: 2015-12-19
- Original language: English
- Number of items: 1
- Dimensions: 9.25" h x .31" w x 7.52" l, .0 pounds
- Binding: Paperback
- 140 pages
Review
"Every significant shift in software development demands rethinking our approaches. Real-time and asynchronous web applications pose a huge challenge in web development today. This book does an excellent job explaining how RxJS addresses those challenges and teaches you how to rethink your world in terms of Observables." -Zef Hemel, VP Engineering STX Next
"This book is as hot as reactive programming itself! With great writing, clear explanations, and practical examples, this is a fantastic resource for learning RxJS." -Fred Daoud, Software Development contractor
About the Author
Sergi Mansilla is a professional developer with more than 15 years of experience who believes that software can change the world for the better. He's an expert on Node.js and mobile development, and he's currently working on Firefox OS, a new mobile Operating System based on the web. Sergi speaks at conferences all around the world, and lives in Amsterdam with his lovely wife.
Most helpful customer reviews
7 of 8 people found the following review helpful.
Very disappointing
By A. Computing
This is a very badly put together book. I think the other reviewers must either know the author or haven't gone through coding up the examples.
It starts off describing the world of Rx, all familiar to me as I've used it since 2010 albeit not for JavaScript development. Then comes the first exercise, the creation of an earthquake monitoring application. There's no real guidance here just a bunch of loosely related files that the reader must figure out how to assemble. The promise is to remove callback hell but the code is just a series of callbacks (see attached). It's awfully structured as well with some scripts dumped in the HTML pages and others referenced in external files. In the uploaded picture, just where is the loadJSONP(...) function? Who knows? Oh, it's an island of script back in index.html.
The book promised so much but fails to deliver. I think the main issue is lazyness with the exercises/examples, followed by poor code structure and I don't know why the author doesn't make use of ES6 features such as arrows instead of passing functions around everywhere.
3 of 3 people found the following review helpful.
This adds to a lot of bad mental load when reading the book
By adam
Just started reading and the 2nd chapter starts with broken code and examples that have small differences. This adds to a lot of bad mental load when reading the book.
This code[...]is broken. Because there is no response property on the data that comes back [...]
So what you get if you follow the code from the book is "Uncaught TypeError: Cannot read property 'features' of undefined". So what you need to do is change the flatMap code too look like this ".flatMap((dataset) => Rx.Observable.from(dataset.features)):"
Things like this makes it way harder too learn from the book since you need too spend time debugging the example code.
+ You will learn too debug code.
- Way too unpolished.
2 of 2 people found the following review helpful.
Would learn from this book but do not buy.
By Coder 83
If you can grab this book for free, go ahead, but don't pay for it:
1. It uses RxJs 4.0 and RxJs 5.0 is out and much of the syntax related to operators has changed.
2. The examples are poor choices. The enemy spaceship annoyed me. I guess the author was appealing to millennials while I would have preferred something geared more towards business events.
3. While all books have erratas, some key errors are in this and if RxJs is new to you, it can become frustrating.
But I am glad I read this book, I got it for free, and it helped open my eyes much better about RxJs Observables and Operators.
Unfortunately, despite this technology being out for a few years, there are very few books on it, and the GitHub for 5.0 documentation is scarce leaving you to flip back and forth to the 4.0 GitHub to see what changed.
I am absolutely convinced this will be part of the ES7 advances because this type of Observables is light years better than Promises and Promises are light years ahead of callback hell.
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