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Make the most of today's JavaScript--even if you've never programmed anything before. JavaScript Absolute Beginner's Guide, Third Edition is the fastest way to learn JavaScript, starting with the basics and gradually going deeper and broader into all the techniques you need to begin building highly scalable, performant web apps and experiences. Do what you want, the way you want, one incredibly easy step at a time! Learn all this, and much more: Start fast with the basics: values, variables, functions, conditionals, loops, closures, and more | Create well-organized, clear code that's…mehr
Make the most of today's JavaScript--even if you've never programmed anything before. JavaScript Absolute Beginner's Guide, Third Edition is the fastest way to learn JavaScript, starting with the basics and gradually going deeper and broader into all the techniques you need to begin building highly scalable, performant web apps and experiences. Do what you want, the way you want, one incredibly easy step at a time!
Learn all this, and much more:
Start fast with the basics: values, variables, functions, conditionals, loops, closures, and more
Create well-organized, clear code that's easy to reuse and improve
Learn proven best practices to build web apps that scale with outstanding performance
Make the most of powerful object-oriented techniques to build complex, extensible apps
Wrangle data like a pro by learning how to use the popular JSON standard, arrays, web storage, and more
Translate your ideas into visually compelling and interactive content by learning how to work with the DOM
Identify and fix issues quickly by learning how to use the in-browser development tools
Understand the ins and outs of events and how you can use them to react to actions the user or the page will perform
Learn how to ensure your code runs lightning-fast with extra coverage of performance optimizations and techniques you can use
Learn the basics that set you up to more quickly use modern web frameworks like React, Vue, Next.js, and Nuxt
Explore advanced features such as object destructuring, making web requests, the class syntax, accessing your webcam, variable hoisting, and more
Get up-to-speed on the latest JavaScript enhancements proposed by the EcmaScript standard
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Kirupa Chinnathambi has spent most of his life trying to teach others to love web development as much as he does. In 1999, before blogging was even a word, he started posting tutorials on kirupa.com. In the years since then, he has written hundreds of articles, written a few books (none as good as this one, of course!), and recorded a bunch of videos you can find on YouTube. When he isn't writing or talking about web development, he spends his waking hours helping make developers happy and productive as a Product Manager at Google. In his nonwaking hours, he is probably sleeping, joining Meena in running after their daughter Akira, protecting himself from Pixel (aka a T-rex in an unassuming cat's body)...or writing about himself in the third person.
You can find him on Twitter, Facebook, LinkedIn, and the interwebs at large. Just search for his name in your favorite search engine.
Inhaltsangabe
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
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 dowhile!...................... 57 The for Loop................59 The Starting Point........62 Some for Loop Examples..........................64 The Other Loops.........67 6 Commenting Your CodeFTW!.... 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
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 ValuesInfinity 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
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
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
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
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
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 dowhile!...................... 57 The for Loop................59 The Starting Point........62 Some for Loop Examples..........................64 The Other Loops.........67 6 Commenting Your CodeFTW!.... 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
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 ValuesInfinity 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
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
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
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
9780137959167, TOC, 10/13/2022
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