JavaScript with Promises

Managing Asynchronous Code

Daniel Parker (Autor)

Buch | Softcover

94 Seiten

2015
O'Reilly Media (Verlag)
978-1-4493-7321-4 (ISBN)

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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.
Topics include:

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

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.

Chapter 1Asynchronous JavaScript
Callbacks
Asynchronous JavaScript
Run to Completion and the Event Loop
Summary
Chapter 2Introducing Promises
Basic Usage
Multiple Consumers
Promise States
Chaining Promises
Callback Execution Order
Basic Error Propagation
The Promise API
Summary
Chapter 3Working with Standard Promises
The Async Ripple Effect
Conditional Logic
Parallel Execution
Sequential Execution Using Loops or Recursion
Managing Latency
Functional Composition
Summary
Chapter 4Using Libraries and Frameworks
Promise Interoperability and Thenables
The Bluebird Promise Library
Promises in jQuery
Summary
Chapter 5Error Handling
Rejecting Promises
Passing Errors
Unhandled Rejections
Implementing try/catch/finally
Using the Call Stack
Summary
Chapter 6Combining ECMAScript 6 Features with Promises
Destructuring
Arrow Functions
Iterables and Iterators
Generators
Summary

Erscheint lt. Verlag	14.7.2015
Zusatzinfo	black & white illustrations
Verlagsort	Sebastopol
Sprache	englisch
Maße	178 x 233 mm
Gewicht	166 g
Einbandart	kartoniert
Themenwelt	Informatik ► Web / Internet ► JavaScript
Schlagworte	ECMAScript • Futures • JavaScript • Nebenläufigkeit • Parallele Programmierung • Promises • Webentwicklung
ISBN-10	1-4493-7321-6 / 1449373216
ISBN-13	978-1-4493-7321-4 / 9781449373214
Zustand	Neuware