Learn Enough JavaScript to Be Dangerous: Write Programs, Publish Packages, and Develop Interactive Websites with JavaScript

All You Need to Know, and Nothing You Don't, to Write JavaScript for the Web and Beyond JavaScript plays a key role in modern software development, not only because it is the only language that runs inside virtually all web browsers, but also because it has become widely used for back-end and general-purpose development as well. Although JavaScript is a big language, you don't need to learn "everything" about it to get started, just how to use it efficiently to solve real problems. In Learn Enough JavaScript to Be Dangerous, renowned instructor Michael Hartl teaches the specific concepts, skills, and approaches you need to be professionally productive. Even if you've never programmed before, Hartl helps you quickly build technical sophistication and master the lore you need to succeed. Treating JavaScript as a general-purpose language right from the start, Hartl offers examples for creating dynamic effects in browsers and for writing scripts and modules using Node.js. Focused exercises help you internalize what matters, without wasting time on details pros don't care about. Soon, it'll be like you were born knowing this stuff--and you'll be suddenly, seriously dangerous. Learn enough about . . . Rapidly deploying a simple JavaScript app to the live Web Working with strings and other native JavaScript objects Applying functions and elegant, powerful functional-programming techniques Creating new objects with both properties and methods Writing tests and improving code with test-driven development (TDD) Developing and using self-contained, modular NPM software packages Adding interactivity with event listeners, dynamic HTML forms, and DOM manipulation Writing useful, nontrivial JavaScript shell scripts Building an industrial-grade interactive website with JavaScript, from start to finish Michael Hartl's Learn Enough series includes books and video courses that focus on the most important parts of each subject, so you don't have to learn everything to get started--you just have to learn enough to be dangerous and solve technical problems yourself. Register your book for convenient access to downloads, updates, and/or corrections as they become available. See inside book for details.

Table of Contents:
Preface xiii About the Author xvii Chapter 1: Hello, World! 1 1.1 Introduction to JavaScript 5 1.2 JS in a Web Browser 7 1.3 JS in a REPL 14 1.4 JS in a File 21 1.5 JS in a Shell Script 22 Chapter 2: Strings 25 2.1 String Basics 25 2.2 Concatenation and Interpolation 27 2.3 Printing 33 2.4 Properties, Booleans, and Control Flow 35 2.5 Methods 44 2.6 String Iteration 50 Chapter 3: Arrays 55 3.1 Splitting 55 3.2 Array Access 56 3.3 Array Slicing 58 3.4 More Array Methods 59 3.5 Array Iteration 62 Chapter 4: Other Native Objects 65 4.1 Math and Number 65 4.2 Dates 69 4.3 Regular Expressions 73 4.4 Plain Objects 81 4.5 Application: Unique Words 83 Chapter 5: Functions 91 5.1 Function Definitions 91 5.2 Functions in a File 95 5.3 Method Chaining 104 5.4 Iteration for Each 110 Chapter 6: Functional Programming 115 6.1 Map 116 6.2 Filter 122 6.3 Reduce 126 Chapter 7: Objects and Prototypes 135 7.1 Defining Objects 135 7.2 Prototypes 139 7.3 Modifying Native Objects 147 Chapter 8: Testing and Test-Driven Development 153 8.1 Testing Setup 154 8.2 Initial Test Coverage 159 8.3 Red 164 8.4 Green 172 8.5 Refactor 177 Chapter 9: Events and DOM Manipulation 187 9.1 A Working Palindrome Page 187 9.2 Event Listeners 192 9.3 Dynamic HTML 202 9.4 Form Handling 205 Chapter 10: Shell Scripts with Node.js 215 10.1 Reading from Files 216 10.2 Reading from URLs 218 10.3 DOM Manipulation at the Command Line 224 Chapter 11: Full Sample App: Image Gallery 235 11.1 Prepping the Gallery 235 11.2 Changing the Gallery Image 242 11.3 Setting an Image as Current 250 11.4 Changing the Image Info 252 11.5 Conclusion 259 Index 263