JavaScript with Promises

javascript with Promises by Daniel Parker
English | June 23, 2015 | ISBN: 1449373216 | 88 Pages | EPUB/MOBI | 1.63 MB
If you're a developer moving to an environments that make heavy use of asynchronous APIs, such as Node, WinRT, or Chrome packaged apps, this book teaches you how to make use of promise constructs. javascript routinely supports asynchronous code, calling a function with no expectation of when a response might come back.
Unfortunately, writing code in that style is difficult for humans, and promises are a key tool for bridging that gap. This book shows you how to use these tools, and also demonstrates techniques that enable you to use features like.

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



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