Learning jQuery Deferreds. Taming Callback Hell with Deferreds and Promises - Helion
ebook
Autor: Terry Jones, Nicholas H. TollerveyISBN: 978-14-493-6935-4
stron: 132, Format: ebook
Data wydania: 2013-12-27
Księgarnia: Helion
Cena książki: 92,65 zł (poprzednio: 107,73 zł)
Oszczędzasz: 14% (-15,08 zł)
Tagi: jQuery - Programowanie
Orchestrating asynchronous function calls in JavaScript often leads to callback hell, but there is a reliable way to avoid this painful state of affairs. With this concise and simple guide, you’ll learn how to use jQuery deferreds and promises, an elegant approach for managing asynchronous calls in both client and server applications.
This book contains 18 examples that use deferreds to solve progressively challenging real-world programming problems, along with 75 stimulating puzzles (and their solutions) that will help you understand how and when to use deferreds. You’ll learn new tricks in a fun way, and become immersed in the practice of event-based programming.
- Understand the logic behind creating deferreds and returning promises
- Get a structured explanation of jQuery’s deferred API
- Delve into the dynamics of using deferreds
- Explore a broad collection of useful deferred recipes developed by the authors
- Gain hands-on experience by solving challenges that accompany each recipe
- Go deeper into deferreds: encounter novel abstractions and mind-bending use cases
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Spis treści
Learning jQuery Deferreds. Taming Callback Hell with Deferreds and Promises eBook -- spis treści
- Learning jQuery Deferreds
- Preface
- About You
- Our Aims
- Challenges
- jQuery Deferreds
- Our JavaScript Coding Style, or Lack Thereof
- Conventions Used in This Book
- Using Code Examples
- Safari Books Online
- How to Contact Us
- Acknowledgments
- 1. Introduction
- Food for Thought
- Terminology: Deferreds and Promises
- Familiar Promises
- 2. The jQuery Deferred API
- Consuming Promises
- More Terminology: Resolve, Reject and Progress
- done
- fail
- always
- progress
- promise
- then
- state
- when
- Creating Deferreds
- Construction
- resolve and resolveWith
- reject and rejectWith
- notify and notifyWith
- Putting It All Together
- Deferred Dynamics
- Deprecated Promise Methods
- isRejected and isResolved
- pipe
- Changes in the jQuery Deferred API
- Consuming Promises
- 3. Deferred Recipes
- A Replacement for the setTimeout Function
- Challenges
- Messaging in Chrome Extensions
- Challenges
- Accessing Chrome Local Storage
- Challenges
- Running Promise-Returning Functions One by One
- Challenges
- A Promise Pool with an emptyPromise Method
- Creating a Promise Pool
- Using the Promise Pool
- Challenges
- Displaying Google Maps
- Challenges
- Communicating with a Web Worker
- The Web Worker Code
- Creating a Web Worker
- Using It
- Summary
- Challenges
- Using Web Sockets
- The Web Socket Server
- The Web Socket Client
- Challenges
- Automatically Retrying Failing Deferred Calls
- Challenges
- Memoization
- Discussion
- Avoiding the Dogpile Effect
- Challenges
- Short-Term Memoization of In-Progress Function Calls
- createUser Is Not Idempotent
- Challenges
- Streaming Promise Events
- Delivering More Information
- Delegating the Event Stream
- To Be Continued
- Challenges
- Getting the First Result from a Set of Promises
- Which Promise Fired?
- A Fly in the Soup
- delegateEventStream Redux
- Challenges
- A Deferred Queue
- Challenges
- when2: An Improved jQuery.when
- Using when2 to Time Out a Single Promise
- Differences from $.when
- Challenges
- Timing Out Promises
- Challenges
- Controlling Your Own Destiny
- Challenges
- Deactivating a Promise
- Challenges
- A Replacement for the setTimeout Function
- 4. More Time in the Mental Gymnasium
- Do You Really Understand jQuery Deferreds?
- Promises/A+
- Promises Are First-Class Objects for Function Calls
- Asynchronous Data Structures
- Advantages of Deferreds
- Difficulties with Deferreds
- Further Reading
- A. Hints for Selected Challenges
- A Replacement for the setTimeout Function
- Messaging in Chrome Extensions
- Accessing Chrome Local Storage
- Running Promise-Returning Functions One by One
- A Promise Pool with an emptyPromise Method
- Displaying Google Maps
- Communicating with a Web Worker
- Using Web Sockets
- Automatically Retrying Failing Deferred Calls
- Memoization
- Short-Term Memoization of In-Progress Function Calls
- Streaming Promise Events
- Getting the First Result from a Set of Promises
- A Deferred Queue
- when2: An Improved jQuery.when
- Timing Out Promises
- Controlling Your Own Destiny
- Deactivating a Promise
- B. The Promises/A+ Specification
- Terminology
- Requirements
- Promise States
- The then Method
- The Promise Resolution Procedure
- C. Converting an ArrayBuffer to Base 64
- Colophon
- Copyright