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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



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