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JavaScript with Promises, by Daniel Parker
Download JavaScript with Promises, by Daniel Parker
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Asynchronous JavaScript is everywhere, whether you’re using Ajax, AngularJS, Node.js, or WebRTC. This practical guide shows intermediate to advanced JavaScript developers how Promises can help you manage asynchronous code effectively—including the inevitable flood of callbacks as your codebase grows. You’ll learn the inner workings of Promises and ways to avoid difficulties and missteps when using them.
The ability to asynchronously fetch data and load scripts in the browser broadens the capabilities of JavaScript applications. But if you don’t understand how the async part works, you’ll wind up with unpredictable code that’s difficult to maintain. This book is ideal whether you’re new to Promises or want to expand your knowledge of this technology.
- Understand how async JavaScript works by delving into callbacks, the event loop, and threading
- Learn how Promises organize callbacks into discrete steps that are easier to read and maintain
- Examine scenarios you’ll encounter and techniques you can use when writing real-world applications
- Use features in the Bluebird library and jQuery to work with Promises
- Learn how the Promise API handles asynchronous errors
- Explore ECMAScript 6 language features that simplify Promise-related code
- Sales Rank: #179523 in Books
- Published on: 2015-06-19
- Released on: 2015-06-19
- Original language: English
- Number of items: 1
- Dimensions: 9.19" h x .22" w x 7.00" l, .0 pounds
- Binding: Paperback
- 94 pages
About the Author
Daniel Parker is a software developer focused on web and mobile applications. He writes JavaScript for Evernote in Austin, Texas and is the organizer of the Austin Google Developer Group.
Most helpful customer reviews
7 of 7 people found the following review helpful.
Good general introduction to JavaScript promises and other ES6 language features
By Jim Fathman
JavaScript is evolving so we can write asynchronous programs that look more like synchronous programs. Promises and generators have arrived with ES6, and async and await keywords are coming in ES7. It will take time for JavaScript idiom to coalesce around promises, and more time for essential libraries to adapt or be replaced by modern alternatives. During these changes, we will need several books to help us understand and properly apply these new JavaScript language features.
This book about JavaScript promises is more booklet than book, but it is very worthwhile. It is terse and exacting. If you already know JavaScript and you want to learn about promises (and generators, and iterators), you can read this book and try the exercises in a couple of sittings and come away with a good appreciation for what promises adds to JavaScript.
I have wondered whether the Bluebird promise library will retain purpose after ES6 is widely deployed. This book bases several examples on Bluebird, and the answer seems to be that Bluebird provides useful extended features that will continue to make it a valid choice above and beyond the basic promise features now found in JavaScript itself.
We need more books on promises to augment this book. In particular, I would like to spend time in a book with exercises and examples that build on basic concepts and explore when and how to use Bluebird for Node.js server side programming. But as a general introduction to promises that will help us get started, I highly recommend this book.
2 of 2 people found the following review helpful.
Concise, Well-written, and Packed with great info
By Nishanth
The book offers an in-depth analysis of the JavaScript event loop before delving into the realms of async programming, which should serve as a great introduction for beginners and a good refresher for advanced JavaScript programmers. Daniel also does an amazing job discussing recommended design patterns: The book also has an entire chapter dedicated to explaining parallel, series, waterfall, and more async control flows with easy-to-follow examples, that can be used as reference material in the future. The book also covers the most important parts of Bluebird and jQuery Promises, explaining the nuances with the mark of a person with thorough knowledge on the topic. The book definitely will give you a solid foundation on Promises and async JavaScript. All of this in less than about 100 pages! The book is packed with info and is a must-read. Highly recommend.
2 of 2 people found the following review helpful.
Five Stars
By Jerome Covington
Explains clearly the "why" and not just the "how". A first rate guide to using Promises.
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