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

27
Workers

WHAT'S IN THIS CHAPTER?

Introduction to workers
Running background tasks with dedicated workers
Using with shared workers
Managing requests with service workers

The statement “JavaScript is single-threaded” is practically a mantra for the frontend development community. This assertion, although it makes some simplifying assumptions, effectively describes how the JavaScript environment generally behaves inside a browser. Therefore, it is useful as a pedagogical tool for helping web developers understand JavaScript.

This single-threaded paradigm is inherently restrictive as it prevents programming patterns that are otherwise feasible in languages capable of delegating work to separate threads or processes. JavaScript is bound to this single-threaded paradigm to preserve compatibility with the various browser APIs that it must interact with. Constructs such as the Document Object Model would encounter problems if subjected to concurrent mutations via multiple...