Javascript Absolute Beginners Guide, 3rd edition
Published by Que Publishing (November 11, 2022) © 2023
- Kirupa Chinnathambi
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Introduction...................1
   Parlez-Vous JavaScript? 2
   Contacting Me/Getting Help...................... 2
1 Hello, World!... 5
   What Is JavaScript?....... 7
   Hello, World!.................. 9
   Statements, Expressions, and Functions..12
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I The Basic Stuff
2 Values and Variables..................... 15
   Using Variables............16
   More Variable Stuff......18
3 Functions....... 23
   What Is a Function?.....26
   A Simple Function.......26
   Creating a Function That Takes Arguments...........................30
   Creating a Function That Returns Data...35
4 Conditional Statements: if, else, and switch............... 39
   The If/Else Statement..40
   Switch Statements.......49
   Deciding Which to Use..............................55
5 Looping with for, while, and do…while!...................... 57
   The for Loop................59
   The Starting Point........62
   Some for Loop Examples..........................64
   The Other Loops.........67
6 Commenting Your Code…FTW!.... 71
   What Are Comments?.72
   Commenting Best Practices......................76
7 Timers............ 79
   Delaying with setTimeout..........................80
8 Variable Scope.............................. 85
   Global Scope...............86
   Local Scope..................88
   Miscellaneous Scoping Shenanigans.......89
9 Closures......... 95
   Functions Within Functions.......................96
   When the Inner Functions Aren't Self-Contained................100
10 Where Should Your Code Live?.. 109
   Approach #1: All the Code Lives in Your HTML Document...................113
   Approach #2: The Code Lives in a Separate File................114
   So, Which Approach to Use?..................118
11 Console Logging Basics.............. 123
   Meet the Console......124
   Displaying the Console............................126
   If You Want to Follow Along...................127
   Console Logging 101..............................128
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II It's an Object-Oriented World
12 Of Pizza, Types, Primitives, and Objects................... 135
   Let's First Talk About Pizza.......................136
   From Pizza to JavaScript!.........................139
   What Are Objects?....141
   The Predefined Objects Roaming Around in JavaScript....142
13 Arrays.......... 145
   Creating an Array......146
   Accessing Array Values............................147
   Adding Items.............149
   Removing Items.........151
   Finding Items.............152
   Merging Arrays..........152
   Mapping, Filtering, and Reducing Arrays.............................153
   The Old School Way.153
   Modifying Each Array Item with map.....154
   Getting One Value from an Array of Items...........................157
   A Short Foray into Functional Programming........................160
14 Strings......... 161
   The Basics...................162
   String Properties and Methods...............163
15 Combining Strings and Variables 173
   Our Setup...................174
16 When Primitives Behave Like Objects....................... 179
   Strings Aren't the Only Problem.............180
   Let's Pick on Strings Anyway...................180
   Why This Matters.......182
17 Numbers...... 185
   Using a Number........186
   Operators...................187
   Incrementing and Decrementing............188
   Hexadecimal and Octal Values...............190
   Special Values—Infinity and NaN...........190
   The Math Object.......191
   Random Numbers.....196
18 Getters and Setters.................... 201
   A Tale of Two Properties..........................202
   Meet Getters and Setters........................205
19 A Deeper Look at Objects.......... 211
   Meet the Object........212
   Creating Custom Objects........................222
   The this Keyword.......226
20 Using Classes.............................. 231
   The Class Syntax and Object Creation..232
   Extending Objects.....240
21 Extending Built-in Objects.......... 247
   Say Hello to prototype Again, Sort Of!..249
   Using a Subclassing Approach................253
   Extending Built-in Objects Is Controversial................255
22 Arrow Functions......................... 259
   What Are Arrow Functions?.....................260
   Putting It All Together..............................263
23 Making Sense of this and More.. 265
   The this Keyword 101..............................266
24 Booleans and the Stricter === and !== Operators... 277
   The Boolean Object..278
   The Boolean Function..............................278
   Strict Equality and Inequality Operators281
25 Null and Undefined.................... 283
   Null..............................284
   Undefined...................284
26 All About JSON (JavaScript Object Notation).......... 287
   What Is JSON?...........288
   Looking Inside a JSON Object...............292
   Reading JSON Data..297
   Writing JSON Data?..300
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III Working with the DOM
27 JS, the Browser, and the DOM... 303
   What HTML, CSS, and JavaScript Do....304
   HTML Defines the Structure....................304
   Prettify My World, CSS!...........................306
   It's JavaScript Time!...307
   Meet the Document Object Model........309
28 Finding Elements in the DOM.... 315
   Meet the querySelector Family...............316
   It Really Is the CSS Selector Syntax........318
29 Modifying DOM Elements.......... 321
   DOM Elements Are Objects, Sort Of!....322
   Let's Actually Modify DOM Elements.....324
30 Styling Our Content................... 337
   Why Would We Set Styles Using JavaScript?..............338
   A Tale of Two Styling Approaches..........338
31 Using CSS Custom Properties.... 345
   What Are CSS Custom Properties/Variables?................346
   Setting Complex Values Easily................348
32 Traversing the DOM................... 353
   Finding Your Way Around........................354
   Putting It All Together..............................358
33 Creating and Removing DOM Elements.................... 363
   Creating Elements.....364
   Removing Elements..372
   Cloning Elements......374
34 Quickly Adding Many Elements into the DOM......... 381
   General Approach.....383
   Getting Started..........384
35 In-Browser Developer Tools........ 397
   Meet the Developer Tools.......................398
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IV Dealing with Events
36 Events.......... 417
   What Are Events?......418
   Events and JavaScript..............................420
   A Simple Example.....423
   The Event Arguments and the Event Type.............426
37 Event Bubbling and Capturing... 429
   Event Goes Down, Event Goes Up........430
   Meet the Phases........434
   Who Cares?................437
   Event, Interrupted.....438
38 Mouse Events............................. 443
   Meet the Mouse Events...........................444
   The MouseEvent Properties....................451
   Dealing with the Mouse Wheel..............454
39 Keyboard Events........................ 457
   Meet the Keyboard Events......................458
   Using These Events...459
   The Keyboard Event Properties..............460
   Some Examples.........461
40 Page Load Events and Other Stuff............................ 467
   The Things That Happen During Page Load..........468
   The DOMContentLoaded and load Events................471
   Scripts and Their Location in the DOM.473
   Script Elements: async and defer...........477
41 Loading Script Files Dynamically 481
   The Basic Technique.482
   Running Our Dynamically Loaded Script First............486
   Running Dependent Code After Our Script File Has Loaded........488
42 Handling Events for Multiple Elements..................... 491
   How to Do All This....493
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V Totally Useful Topics that Only Make Sense Now
43 Using Emojis in HTML, CSS, and JavaScript.............. 501
   What Are Emojis Exactly?........................502
   Emojis in HTML..........503
44 Making HTTP/Web Requests in JavaScript................ 511
   The Example..............513
   Meet Fetch.................514
   Meet XMLHttpRequest............................520
45 Accessing the Webcam............... 529
   The Example..............530
   Overview of How This Works..................531
   Adding the Code.......532
   Examining the Code.535
46 Array and Object Destructuring. 539
   Destructuring Examples...........................541
47 Storing Data Using Web Storage.............................. 549
   How Web Storage Works........................550
   Getting Your Code On.............................552
48 Variable and Function Hoisting.. 559
   JavaScript and Compiler Behavior.........560
49 Working with Sets...................... 565
   Creating a Set, Part I.566
   Adding Items to a Set..............................567
   How Checking for Duplicates Works......567
   Creating a Set, Part 2569
   Checking the Size of Our Set..................570
   Deleting Items from a Set.......................571
   Checking If an Item Exists.......................572
   Looping Through Items in a Set.............572
   Entries, Keys, and Values.........................573
50 Conclusion... 577
Glossary............................ 581
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9780137959167, TOC, 10/13/2022
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