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

GARBAGE COLLECTION

JavaScript is a garbage-collected language, meaning that the execution environment is responsible for managing the memory required during code execution. In languages such as C and C++, keeping track of memory usage is a principle concern and the source of many issues for developers. JavaScript frees developers from worrying about memory management by automatically allocating what is needed and reclaiming memory that is no longer being used. The basic idea is simple: figure out which variables aren't going to be used and free the memory associated with them. This process is periodic, with the garbage collector running at specified intervals (or at predefined collection moments in code execution). The process of garbage collection is an approximate and imperfect solution because the general problem of knowing whether some piece of memory is needed is “undecidable,” meaning it cannot be solved by an algorithm.

Consider the normal life cycle of a local...