You're reading from Professional JavaScript for Web Developers Discover an easy-to-learn guide to upgrade your JavaScript skills

Product type Paperback

Published in Nov 2019

Publisher Wiley

ISBN-13 9781119366447

Length 1144 pages

Edition 4th Edition

Languages

JavaScript

Tools

Combine

Concepts

Web Programming

Author (1):

Matt Frisbie

View More author details

Table of Contents (37) Chapters

COVER FREE CHAPTER

FOREWORD

INTRODUCTION

1 What Is JavaScript?

2 JavaScript in HTML

3 Language Basics

4 Variables, Scope, and Memory

5 Basic Reference Types

6 Collection Reference Types

7 Iterators and Generators

8 Objects, Classes, and Object-Oriented Programming

9 Proxies and Reflect

10 Functions

11 Promises and Async Functions

12 The Browser Object Model

13 Client Detection

14 The Document Object Model

15 DOM Extensions

16 DOM Levels 2 and 3

17 Events

18 Animation and Graphics with Canvas

19 Scripting Forms

20 JavaScript APIs

21 Error Handling and Debugging

22 XML in JavaScript

23 JSON

24 Network Requests and Remote Resources

25 Client-Side Storage

26 Modules

27 Workers

28 Best Practices

A ES2018 and ES2019

B Strict Mode

C JavaScript Libraries and Frameworks

D JavaScript Tools

INDEX

END USER LICENSE AGREEMENT

INTRODUCTION TO ASYNCHRONOUS PROGRAMMING

The duality between synchronous and asynchronous behavior is a fundamental concept in computer science—especially in a single-threaded event loop model such as JavaScript. Asynchronous behavior is borne out of the need to optimize for higher computational throughput in the face of high-latency operations. If it is feasible to run other instructions while a computation is completing and still maintain a stable system, then it is pragmatic to do so.

Importantly, an asynchronous operation is not necessarily a computationally intensive or high-latency operation. It can be used anywhere it doesn't make sense to block a thread of execution to wait for the asynchronous behavior to occur.

Synchronous vs. Asynchronous JavaScript

Synchronous behavior is analogous to sequential processor instructions in memory. Each instruction is executed strictly in the order in which it appears, and each is also capable of immediately retrieving information...