Daniel Parker - JavaScript with Promises
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Asynchronous JavaScript is everywhere, whether youre using Ajax, AngularJS, Node.js, or WebRTC. This practical guide shows intermediate to advanced JavaScript developers how Promises can help you manage asynchronous code effectivelyincluding the inevitable flood of callbacks as your codebase grows. Youll 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 dont understand how the async part works, youll wind up with unpredictable code thats difficult to maintain. This book is ideal whether youre 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 youll 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
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by Daniel Parker
Copyright 2015 Daniel Parker. All rights reserved.
Printed in the United States of America.
Published by OReilly Media, Inc. , 1005 Gravenstein Highway North, Sebastopol, CA 95472.
OReilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (http://safaribooksonline.com). For more information, contact our corporate/institutional sales department: 800-998-9938 or corporate@oreilly.com .
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- Illustrator: Rebecca Demarest
- June 2015: First Edition
- 2015-05-28: First Release
- 2015-07-17: Second Release
See http://oreilly.com/catalog/errata.csp?isbn=9781449373214 for release details.
The OReilly logo is a registered trademark of OReilly Media, Inc. JavaScript with Promises, the cover image of a white-crested helmetshrike, and related trade dress are trademarks of OReilly Media, Inc.
While the publisher and the author have used good faith efforts to ensure that the information and instructions contained in this work are accurate, the publisher and the author disclaim all responsibility for errors or omissions, including without limitation responsibility for damages resulting from the use of or reliance on this work. Use of the information and instructions contained in this work is at your own risk. If any code samples or other technology this work contains or describes is subject to open source licenses or the intellectual property rights of others, it is your responsibility to ensure that your use thereof complies with such licenses and/or rights.
978-1-449-37321-4
[LSI]
Asynchronous JavaScript is everywhere. AJAX, WebRTC, and Node.js are a few examples of where asynchronous APIs are found. Although it is easy to write a quick function to handle the result of one HTTP request, it is also easy to get lost in an unpredictable sea of callbacks as a codebase grows and more people contribute. Thats where a good approach for handling asynchronous code comes in and many developers are choosing to use Promises in their approach.
This is the book I needed when originally choosing an asynchronous strategy, and it is the result of my experience using promises in JavaScript applications. It explains their use and inner workings while exposing difficulties and missteps. Promises are made up of only a few concepts with a small API. But in the same way that Java Scripts small number of simple constructs are used to create elegant and powerful solutions, I am surprised and pleased at the number of ways Promises can be used to effectively manage asynchronous code.
This book is for intermediate and advanced JavaScript developers who want to write asynchronous code. These developers may be comfortable with JavaScript for traditional web APIs but are moving to environments such as Node.js, Google Chrome packaged apps, or building desktop applications with JavaScript. Developers who write browser-based code and want to use frameworks such as Angular or newer browser technologies such as Service Workers or WebRTC will also benefit. Even people who are already experienced with Promises may still enjoy reading the code and discovering additional ideas for their own work.
This is not a book about JavaScript syntax dos and donts. All the examples are intended to be clear and casual; however, this style may conflict with some recommended practices. Those choices are independent of the ideas presented here and you are free to choose as you see fit when approaching these concepts in your code.
The following typographical conventions are used in this book:
ItalicIndicates new terms, URLs, email addresses, filenames, and file extensions.
Constant widthUsed for program listings, as well as within paragraphs to refer to program elements such as variable or function names, databases, data types, environment variables, statements, and keywords.
Constant width boldShows commands or other text that should be typed literally by the user.
Constant width italicShows text that should be replaced with user-supplied values or by values determined by context.
This element signifies a tip or suggestion.
This element signifies a general note.
This element indicates a warning or caution.
Supplemental material (code examples, exercises, etc.) is available for download at https://github.com/dxparker/promises-book-examples.
This book is here to help you get your job done. In general, if example code is offered with this book, you may use it in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.
We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: JavaScript with Promises by Daniel Parker (OReilly). Copyright 2015 Daniel Parker, 978-1-449-37321-4.
If you feel your use of code examples falls outside fair use or the permission given above, feel free to contact us at .
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