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Index
Eloquent JavaScript: A Modern Introduction to Programming Dedication Praise for the First Edition of Eloquent Javascript Introduction
On Programming Why Language Matters What Is JavaScript? Code, and What to Do with It Overview of This Book Typographic Conventions
I. Language
1. Values, Types, and Operators
Values Numbers
Arithmetic Special Numbers
Strings Unary Operators Boolean Values
Comparisons Logical Operators
Undefined Values Automatic Type Conversion
Short-Circuiting of Logical Operators
Summary
2. Program Structure
Expressions and Statements Variables Keywords and Reserved Words The Environment Functions The console.log Function Return Values Prompt and Confirm Control Flow Conditional Execution while and do Loops Indenting Code for Loops Breaking Out of a Loop Updating Variables Succinctly Dispatching on a Value with switch Capitalization Comments Summary Exercises
Looping a Triangle FizzBuzz Chess Board
3. Functions
Defining a Function Parameters and Scopes Nested Scopes Functions as Values Declaration Notation The Call Stack Optional Arguments Closure Recursion Growing Functions Functions and Side Effects Summary Exercises
Minimum Recursion Bean Counting
4. Data Structures: Objects and Arrays
The Weresquirrel Data Sets Properties Methods Objects Mutability The Lycanthrope’s Log Computing Correlation Objects as Maps The Final Analysis Further Arrayology Strings and Their Properties The arguments Object The Math Object The Global Object Summary Exercises
The Sum of a Range Reversing an Array A List Deep Comparison
5. Higher-Order Functions
Abstraction Abstracting Array Traversal Higher-Order Functions Passing Along Arguments JSON Filtering an Array Transforming with map Summarizing with reduce Composability The Cost Great-great-great-great-... Binding Summary Exercises
Flattening Mother-Child Age Difference Historical Life Expectancy Every and Then Some
6. The Secret Life of Objects
History Methods Prototypes Constructors Overriding Derived Properties Prototype Interference Prototype-less Objects Polymorphism Laying Out a Table Getters and Setters Inheritance The instanceof Operator Summary Exercises
A Vector Type Another Cell Sequence Interface
7. Project: Electronic Life
Definition Representing Space A Critter’s Programming Interface The World Object this and Its Scope Animating Life It Moves More Life-forms A More Lifelike Simulation Action Handlers Populating the New World Bringing the World to Life Exercises
Artificial Stupidity Predators
8. Bugs and Error Handling
Programmer Mistakes Strict Mode Testing Debugging Error Propagation Exceptions Cleaning Up After Exceptions Selective Catching Assertions Summary Exercises
Retry The Locked Box
9. Regular Expressions
Creating a Regular Expression Testing for Matches Matching a Set of Characters Repeating Parts of a Pattern Grouping Subexpressions Matches and Groups The Date Type Word and String Boundaries Choice Patterns The Mechanics of Matching Backtracking The replace Method Greed Dynamically Creating RegExp Objects The search Method The lastIndex Property
Looping over Matches
Parsing an INI File International Characters Summary Exercises
Regexp Golf Quoting Style Numbers Again
10. Modules
Why Modules Help
Namespacing Reuse Decoupling
Using Functions as Namespaces Objects as Interfaces Detaching from the Global Scope Evaluating Data as Code The require Function Slow-Loading Modules Interface Design
Predictability Composability Layered Interfaces
Summary Exercises
Month Names A Return to Electronic Life Circular Dependencies
11. Project: A Programming Language
Parsing The Evaluator Special Forms The Environment Functions Compilation Cheating Exercises
Arrays Closure Comments Fixing Scope
II. Browser
12. Javascript and The Browser
Networks and the Internet The Web HTML HTML and JavaScript In the Sandbox Compatibility and the Browser Wars
13. The Document Object Model
Document Structure Trees The Standard Moving Through the Tree Finding Elements Changing the Document Creating Nodes Attributes Layout Styling Cascading Styles Query Selectors Positioning and Animating Summary Exercises
Build a Table Elements by Tag Name The Cat’s Hat
14. Handling Events
Event Handlers Events and DOM Nodes Event Objects Propagation Default Actions Key Events Mouse Clicks Mouse Motion Scroll Events Focus Events Load Event Script Execution Timeline Setting Timers Debouncing Summary Exercises
Censored Keyboard Mouse Trail Tabs
15. Project: A Platform Game
The Game The Technology Levels Reading a Level Actors Encapsulation as a Burden Drawing Motion and Collision Actors and Actions Tracking Keys Running the Game Exercises
Game Over Pausing the Game
16. Drawing on Canvas
SVG The Canvas Element Filling and Stroking Paths Curves Drawing a Pie Chart Text Images Transformation Storing and Clearing Transformations Back to the Game Choosing a Graphics Interface Summary Exercises
Shapes The Pie Chart A Bouncing Ball Precomputed Mirroring
17. HTTP
The Protocol Browsers and HTTP XMLHttpRequest Sending a Request Asynchronous Requests Fetching XML Data HTTP Sandboxing Abstracting Requests Promises Appreciating HTTP Security and HTTPS Summary Exercises
Content Negotiation Waiting for Multiple Promises
18. Forms and Form Fields
Fields Focus Disabled Fields The Form as a Whole Text Fields Checkboxes and Radio Buttons Select Fields File Fields Storing Data Client-Side Summary Exercises
A JavaScript Workbench Autocompletion Conway’s Game of Life
19. Project: A Paint Program
Implementation Building the DOM The Foundation Tool Selection Color and Brush Size Saving Loading Image Files Finishing Up Exercises
Rectangles Color Picker Flood Fill
III. Beyond
20. Node.js
Background Asynchronicity The node Command Modules Installing with NPM The Filesystem Module The HTTP Module Streams A Simple File Server Error Handling Summary Exercises
Content Negotiation, Again Fixing a Leak Creating Directories A Public Space on the Web
21. Project: Skill-Sharing Website
Design Long Polling HTTP Interface The Server
Routing Serving Files Talks as Resources Long-Polling Support
The Client
HTML Starting up Displaying Talks Updating the Server Noticing Changes
Exercises
Disk Persistence Comment Field Resets Better Templates The Unscriptables
22. Javascript and Performance
Staged Compilation Graph Layout Defining a Graph A First Force-Directed Layout Function Profiling Function Inlining Going Back to Old-school Loops Avoiding Work Creating Less Garbage Garbage Collection Writing to Objects Dynamic Types Summary Exercises
Pathfinding Timing Optimizing
A. Exercise Hints
Program Structure
Looping a Triangle FizzBuzz Chess Board
Functions
Minimum Recursion Bean Counting
Data Structures: Objects and Arrays
The Sum of a Range Reversing an Array A List Deep Comparison
Higher-Order Functions
Mother-Child Age Difference Historical Life Expectancy Every and Then Some
The Secret Life of Objects
A Vector Type Another Cell Sequence Interface
Project: Electronic Life
Artificial Stupidity Predators
Bugs and Error Handling
Retry The Locked Box
Regular Expressions
Quoting Style Numbers Again
Modules
Month Names A Return to Electronic Life Circular Dependencies
Project: A Programming Language
Arrays Closure Comments Fixing Scope
The Document Object Model
Build a Table Elements by Tag Name
Handling Events
Censored Keyboard Mouse Trail Tabs
Project: A Platform Game
Game Over Pausing the Game
Drawing on Canvas
Shapes The Pie Chart A Bouncing Ball Precomputed Mirroring
HTTP
Content Negotiation Waiting for Multiple Promises
Forms and Form Fields
A JavaScript Workbench Autocompletion Conway’s Game of Life
Project: A Paint Program
Rectangles Color Picker Flood Fill
Node.js
Content Negotiation, Again Fixing a Leak Creating Directories A Public Space on the Web
Project: Skill-Sharing Website
Disk Persistence Comment Field Resets Better Templates The Unscriptables
JavaScript and Performance
Pathfinding Optimizing
Updates Index About the Author Copyright
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