Scott Adam D., MacDonald Matthew, Powers Shelley - JavaScript Cookbook. Programming The Web (Third Edition).pdf

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JavaScript
Cookbook
Programming
the Web
Adam D. Scott,
Matthew MacDonald
& Shelley Powers
ird n
Th itio
Ed
THIRD EDITION
JavaScript Cookbook
Adam D. Scott, Matthew MacDonald,
and Shelley Powers
JavaScript Cookbook, Third Edition
by Adam D. Scott, Matthew MacDonald, and Shelley Powers
Copyright © 2021 Adam D. Scott and Matthew MacDonald. All rights reserved.
Printed in the United States of America.
Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.
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July 2021:
Third Edition
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Illustrator:
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Revision History for the Third Edition
2021-07-16:
First Release
See
http://oreilly.com/catalog/errata.csp?isbn=9781492055754
for release details.
The O’Reilly logo is a registered trademark of O’Reilly Media, Inc.
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While the publisher and the authors have used good faith efforts to ensure that the information and
instructions contained in this work are accurate, the publisher and the authors disclaim all responsibility
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or reliance on this work. Use of the information and instructions contained in this work is at your own
risk. If any code samples or other technology this work contains or describes is subject to open source
licenses or the intellectual property rights of others, it is your responsibility to ensure that your use
thereof complies with such licenses and/or rights.
978-1-492-05575-4
[LSI]
Table of Contents
Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Part I.
The JavaScript Language
2
3
7
9
11
13
16
20
21
24
28
31
35
38
40
42
43
45
46
47
1. Setting Up a Development Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Choosing a Code Editor
1.2 Using the Developer Console in Your Browser
1.3 Running Blocks of Code in the Developer Console
1.4 Using Strict Mode to Catch Common Mistakes
1.5 Filling in HTML Boilerplate with Emmet Shortcuts
1.6 Installing the npm Package Manager (with Node.js)
1.7 Downloading a Package with npm
1.8 Updating a Package with npm
1.9 Setting Up a Local Test Server
1.10 Enforcing Code Standards with a Linter
1.11 Styling Code Consistently with a Formatter
1.12 Experimenting in a JavaScript Playground
2. Strings and Regular Expressions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
2.1 Checking for an Existing, Nonempty String
2.2 Converting a Numeric Value to a Formatted String
2.3 Inserting Special Characters
2.4 Inserting Emojis
2.5 Using Template Literals for Clearer String Concatenation
2.6 Performing a Case-Insensitive String Comparison
2.7 Checking If a String Contains a Specific Substring
2.8 Replacing All Occurrences of a String
iii

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