Javascript Absolute Beginner's Guide, Third Edition

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

Table of Contents:
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 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   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   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