JavaScript Absolute Beginner's Guide, 2nd edition

  • Kirupa Chinnathambi

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Introduction     1

Parlez-vous JavaScript?     2

Contacting Me/Getting Help     3

Chapter 1  Hello, World!     5

What Is JavaScript?     7

Hello, World!     8

    The HTML Document     8

Looking at the Code: Statements and Functions     11


Chapter 2  Values and Variables     15

Using Variables     16

More Variable Stuff     17

    Naming Variables     17

    More on Declaring and Initializing Variables     18

Chapter 3  Functions     21

What Is a Function?     23

A Simple Function     24

Creating a Function that Takes Arguments     28

Creating a Function that Returns Data     33

    The Return Keyword     33

    Exiting the Function Early     34

Chapter 4  Conditional Statements: If, Else, and Switch     37

The If / Else Statement     39

    Meet the Conditional Operators     41

    Creating More Complex Expressions     44

    Variations on the If / Else Statement     45

    Phew     47

Switch Statements     47

    Using a Switch Statement     47

    Similarity to an If/Else Statement     51

Deciding Which to Use     53

Chapter 5  Looping with For, While, and Do…While!     55

The for Loop     57

    The Starting Point     61

    The Step     61

    The Condition (aka How Long to Keep Looping)     62

    Putting It All Together     62

Some for Loop Examples     63

    Breaking a Loop     63

    Skipping an Iteration     64

    Going Backwards     64

    You Don't Have to Use Numbers     65

    Oh, No He Didn't!     65

The Other Loops     66

    The while Loop     66

    The do…while Loop     66

Chapter 6  Commenting Your CodeFTW!     69

What Are Comments?     70

    Single Line Comments     71

    Multi-Line Comments     72

Commenting Best Practices     73

Chapter 7  Timers     77

Delaying with setTimeout     78

    Looping with setInterval     79

    Animating Smoothly with requestAnimationFrame     80

Chapter 8  Variable Scope     83

Global Scope     84

Local Scope     86

Miscellaneous Scoping Shenanigans     87

Block Scoping     87

    How JavaScript Processes Variables     90

    Closures     92

Chapter 9  Closures     93

Functions within Functions     94

When the Inner Functions Aren't Self-Contained     98

Chapter 10  Where Should Your Code Live?     105

Approach #1: All the Code Lives in Your HTML Document     109

Approach #2: The Code Lives in a Separate File     110

    The JavaScript File     110

    Referencing the JavaScript File     111

So…Which Approach to Use?     114

    Yes, My Code Will Be Used on Multiple Documents!     114

    No, My Code Is Used Only Once on a Single HTML Document!     116


Chapter 11  Console Logging Basics     119

Meet the Console     120

Displaying the Console     121

If You Want to Follow Along     124

Console Logging 101     125

    Meet the Log Method     125

    Going Beyond Predefined Text     127

    Displaying Warnings and Errors     128

Chapter 12  Of Pizza, Types, Primitives, and Objects     133

Let's First Talk About Pizza     134

From Pizza to JavaScript!     136

What Are Objects?     138

The Predefined Objects Roaming Around in JavaScript     140

Chapter 13  Arrays     143

Creating an Array     144

Accessing Array Values     145

Adding Items to Your Array     147

Removing Items from the Array     149

Finding Items in the Array     150

Merging Arrays     150

Mapping, Filtering, and Reducing Arrays     151

The Old School Way     151

Modifying Each Array Item with Map     152

Filtering Items     154

Getting One Value from an Array of Items     155

A Short Foray into Functional Programming     157

Chapter 14  Strings     159

The Basics     160

String Properties and Methods     161

    Accessing Individual Characters     161

    Combining (aka Concatenating) Strings     163

    Getting Substrings out of Strings     164

    Splitting a String/split     165

    Finding Something Inside a String     166

    Upper and Lower Casing Strings     168

Chapter 15  When Primitives Behave Like Objects     169

Strings Aren't the Only Problem     170

Let's Pick on Strings Anyway     170

Why This Matters     172

Chapter 16  Numbers     175

Using a Number176

Operators     176

    Doing Simple Math     177

Incrementing and Decrementing     177

Hexadecimal and Octal Values     179

Special Values—Infinity and NaN     180

    Infinity     180

    NaN     180

The Math Object     180

    The Constants     181

    Rounding Numbers     182

    Trigonometric Functions     183

    Powers and Square Roots     184

    Getting the Absolute Value     185

Random Numbers     185

Chapter 17  Getters and Setters     187

A Tale of Two Properties     188

Meet Getters and Setters     190

    Shout Generator     191

    Logging Activity     191

    Property Value Validation     192

Chapter 18  A Deeper Look at Objects     195

Meet the Object     196

    Creating Objects     197

    Adding Properties     197

    Removing Properties     200

    What Is Going on Behind the Scenes?     201

Creating Custom Objects     205

The this Keyword     209

Chapter 19  Extending Built-in Objects     213

Say Hello to prototype…again—Sort of!     214

Extending Built-in Objects is Controversial     219

    You Don't Control the Built-in Object's Future     219

    Some Functionality Should Not Be Extended or Overridden     219

Chapter 20  Using Classes     221

The Class Syntax and Object Creation     222

    Creating an Object     222

    Meet the Constructor     224

    What Goes Inside the Class     226

Extending Objects     229

Chapter 21  Booleans and the Stricter === and !== Operators     237

The Boolean Object     238

The Boolean Function     238

Strict Equality and Inequality Operators     240

Chapter 22  Null and Undefined     243

Null     244

Undefined     244

PART III:  Working with the DOM

Chapter 23  All About JSON (aka JavaScript Object Notation)     247

What Is JSON?     248

Looking Inside a JSON Object     252

    Property Names     252

    The Values     253

Reading JSON Data     257

    Parsing JSON-looking Data into Actual JSON     259

Writing JSON Data?     259

Chapter 24  JS, the Browser, and the Dom     261

What HTML, CSS, and JavaScript Do     262

HTML Defines the Structure     262

Prettify My World, CSS!     264

It's JavaScript Time!     265

Meet the Document Object Model     267

    The Window Object     269

    The Document Object     269

Chapter 25  Finding Elements in the Dom     273

Meet the querySelector Family     274

    querySelector     275

    querySelectorAll     275

It Really Is the CSS Selector Syntax     276

Chapter 26  Modifying Dom Elements     279

DOM Elements Are Objects—Sort of!     280

Let's Actually Modify DOM Elements     282

    Changing an Element's Text Value     284

    Attribute Values     286

Chapter 27  Styling Our Content     289

Why Would We Set Styles Using JavaScript?     290

A Tale of Two Styling Approaches     290

    Setting the Style Directly     290

    Adding and Removing Classes Using JavaScript     292

Checking Whether a Class Value Exists     294

    Going Further     294

Chapter 28  Traversing the Dom     297

Finding Your Way Around     298

    Dealing with Siblings and Parents     301

    Let's Have Some Kids!     301

Putting It All Together     302

    Checking If A Child Exists     303

    Accessing All the Child Elements     303

    Walking the DOM     303

Chapter 29  Creating and Removing Dom Elements     305

Creating Elements     306

Removing Elements     314

Cloning Elements     315

Chapter 30  In-Browser Developer Tools     323

Meet the Developer Tools     324

    Inspecting the DOM     326

    Debugging JavaScript     331

    Meet the Console     337

    Inspecting Objects     338

    Logging Messages     340


Chapter 31  Events     343

What Are Events?     344

Events and JavaScript     346

    1. Listening for Events     346

    2. Reacting to Events     348

A Simple Example     348

The Event Arguments and the Event Type     351

Chapter 32  Event Bubbling and Capturing     355

Event Goes Down Event Goes Up     356

Meet the Phases     361

Who Cares?     363

Event, Interrupted     364

Chapter 33  Mouse Events     367

Meet the Mouse Events     368

    Clicking Once and Clicking Twice     368

    Mousing Over and Mousing Out     370

    The Very Click-like Mousing Down and Mousing Up Events     372

    The Event Heard Again…and Again…and Again!     373

    The Context Menu     374

The MouseEvent Properties     375

    The Global Mouse Position     375

    The Mouse Position Inside the Browser     376

    Detecting Which Button Was Clicked     377

Dealing with the Mouse Wheel     378

Chapter 34  Keyboard Events     381

Meet the Keyboard Events     382

Using These Events     383

The Keyboard Event Properties     384

Some Examples     385

    Checking That a Particular Key Was Pressed     385

    Doing Something When the Arrow Keys Are Pressed     386

    Detecting Multiple Key Presses     386

Chapter 35  Page Load Events and Other Stuff     391

The Things That Happen During Page Load     392

    Stage Numero Uno     393

    Stage Numero Dos     393

    Stage Numero Three     394

The DOMContentLoaded and load Events     395

Scripts and Their Location in the DOM     397

Script Elements—Async and Defer     400

    async     400

    defer     400

Chapter 36  Handling Events for Multiple Elements     405

How to Do All of This     407

    A Terrible Solution     408

    A Good Solution     409

    Putting It All Together     412

Chapter 37  Conclusion     415

Glossary     419

Index     423

Published by Que Publishing (July 6th 2021) - Copyright © 2020

ISBN-13: 9780137460557

Subject: Web Programming & Design

Category: JavaScript Absolute Beginner's Guide

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