JavaScript: The Definitive Guide. Master the World's Most-Used Programming Language. 7th Edition

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• Preface
  • Conventions Used in This Book
  • Example Code
  • OReilly Online Learning
  • How to Contact Us
  • Acknowledgments
• 1. Introduction to JavaScript
  • 1.1. Exploring JavaScript
  • 1.2. Hello World
  • 1.3. A Tour of JavaScript
  • 1.4. Example: Character Frequency Histograms
  • 1.5. Summary
• 2. Lexical Structure
  • 2.1. The Text of a JavaScript Program
  • 2.2. Comments
  • 2.3. Literals
  • 2.4. Identifiers and Reserved Words
    • 2.4.1. Reserved Words
  • 2.5. Unicode
    • 2.5.1. Unicode Escape Sequences
    • 2.5.2. Unicode Normalization
  • 2.6. Optional Semicolons
  • 2.7. Summary
• 3. Types, Values, and Variables
  • 3.1. Overview and Definitions
  • 3.2. Numbers
    • 3.2.1. Integer Literals
    • 3.2.2. Floating-Point Literals
    • 3.2.3. Arithmetic in JavaScript
    • 3.2.4. Binary Floating-Point and Rounding Errors
    • 3.2.5. Arbitrary Precision Integers with BigInt
    • 3.2.6. Dates and Times
  • 3.3. Text
    • 3.3.1. String Literals
    • 3.3.2. Escape Sequences in String Literals
    • 3.3.3. Working with Strings
    • 3.3.4. Template Literals
      • Tagged template literals
    • 3.3.5. Pattern Matching
  • 3.4. Boolean Values
  • 3.5. null and undefined
  • 3.6. Symbols
  • 3.7. The Global Object
  • 3.8. Immutable Primitive Values and Mutable Object References
  • 3.9. Type Conversions
    • 3.9.1. Conversions and Equality
    • 3.9.2. Explicit Conversions
    • 3.9.3. Object to Primitive Conversions
      • Object-to-boolean conversions
      • Object-to-string conversions
      • Object-to-number conversions
      • Special case operator conversions
      • The toString() and valueOf() methods
      • Object-to-primitive conversion algorithms
  • 3.10. Variable Declaration and Assignment
    • 3.10.1. Declarations with let and const
      • Variable and constant scope
      • Repeated declarations
      • Declarations and types
    • 3.10.2. Variable Declarations with var
    • 3.10.3. Destructuring Assignment
  • 3.11. Summary
• 4. Expressions and Operators
  • 4.1. Primary Expressions
  • 4.2. Object and Array Initializers
  • 4.3. Function Definition Expressions
  • 4.4. Property Access Expressions
    • 4.4.1. Conditional Property Access
  • 4.5. Invocation Expressions
    • 4.5.1. Conditional Invocation
  • 4.6. Object Creation Expressions
  • 4.7. Operator Overview
    • 4.7.1. Number of Operands
    • 4.7.2. Operand and Result Type
    • 4.7.3. Operator Side Effects
    • 4.7.4. Operator Precedence
    • 4.7.5. Operator Associativity
    • 4.7.6. Order of Evaluation
  • 4.8. Arithmetic Expressions
    • 4.8.1. The + Operator
    • 4.8.2. Unary Arithmetic Operators
    • 4.8.3. Bitwise Operators
  • 4.9. Relational Expressions
    • 4.9.1. Equality and Inequality Operators
      • Strict equality
      • Equality with type conversion
    • 4.9.2. Comparison Operators
    • 4.9.3. The in Operator
    • 4.9.4. The instanceof Operator
  • 4.10. Logical Expressions
    • 4.10.1. Logical AND (&&)
    • 4.10.2. Logical OR (||)
    • 4.10.3. Logical NOT (!)
  • 4.11. Assignment Expressions
    • 4.11.1. Assignment with Operation
  • 4.12. Evaluation Expressions
    • 4.12.1. eval()
    • 4.12.2. Global eval()
    • 4.12.3. Strict eval()
  • 4.13. Miscellaneous Operators
    • 4.13.1. The Conditional Operator (?:)
    • 4.13.2. First-Defined (??)
    • 4.13.3. The typeof Operator
    • 4.13.4. The delete Operator
    • 4.13.5. The await Operator
    • 4.13.6. The void Operator
    • 4.13.7. The comma Operator (,)
  • 4.14. Summary
• 5. Statements
  • 5.1. Expression Statements
  • 5.2. Compound and Empty Statements
  • 5.3. Conditionals
    • 5.3.1. if
    • 5.3.2. else if
    • 5.3.3. switch
  • 5.4. Loops
    • 5.4.1. while
    • 5.4.2. do/while
    • 5.4.3. for
    • 5.4.4. for/of
      • for/of with objects
      • for/of with strings
      • for/of with Set and Map
      • Asynchronous iteration with for/await
    • 5.4.5. for/in
  • 5.5. Jumps
    • 5.5.1. Labeled Statements
    • 5.5.2. break
    • 5.5.3. continue
    • 5.5.4. return
    • 5.5.5. yield
    • 5.5.6. throw
    • 5.5.7. try/catch/finally
  • 5.6. Miscellaneous Statements
    • 5.6.1. with
    • 5.6.2. debugger
    • 5.6.3. use strict
  • 5.7. Declarations
    • 5.7.1. const, let, and var
    • 5.7.2. function
    • 5.7.3. class
    • 5.7.4. import and export
  • 5.8. Summary of JavaScript Statements
• 6. Objects
  • 6.1. Introduction to Objects
  • 6.2. Creating Objects
    • 6.2.1. Object Literals
    • 6.2.2. Creating Objects with new
    • 6.2.3. Prototypes
    • 6.2.4. Object.create()
  • 6.3. Querying and Setting Properties
    • 6.3.1. Objects As Associative Arrays
    • 6.3.2. Inheritance
    • 6.3.3. Property Access Errors
  • 6.4. Deleting Properties
  • 6.5. Testing Properties
  • 6.6. Enumerating Properties
    • 6.6.1. Property Enumeration Order
  • 6.7. Extending Objects
  • 6.8. Serializing Objects
  • 6.9. Object Methods
    • 6.9.1. The toString() Method
    • 6.9.2. The toLocaleString() Method
    • 6.9.3. The valueOf() Method
    • 6.9.4. The toJSON() Method
  • 6.10. Extended Object Literal Syntax
    • 6.10.1. Shorthand Properties
    • 6.10.2. Computed Property Names
    • 6.10.3. Symbols as Property Names
    • 6.10.4. Spread Operator
    • 6.10.5. Shorthand Methods
    • 6.10.6. Property Getters and Setters
  • 6.11. Summary
• 7. Arrays
  • 7.1. Creating Arrays
    • 7.1.1. Array Literals
    • 7.1.2. The Spread Operator
    • 7.1.3. The Array() Constructor
    • 7.1.4. Array.of()
    • 7.1.5. Array.from()
  • 7.2. Reading and Writing Array Elements
  • 7.3. Sparse Arrays
  • 7.4. Array Length
  • 7.5. Adding and Deleting Array Elements
  • 7.6. Iterating Arrays
  • 7.7. Multidimensional Arrays
  • 7.8. Array Methods
    • 7.8.1. Array Iterator Methods
      • forEach()
      • map()
      • filter()
      • find() and findIndex()
      • every() and some()
      • reduce() and reduceRight()
    • 7.8.2. Flattening arrays with flat() and flatMap()
    • 7.8.3. Adding arrays with concat()
    • 7.8.4. Stacks and Queues with push(), pop(), shift(), and unshift()
    • 7.8.5. Subarrays with slice(), splice(), fill(), and copyWithin()
      • slice()
      • splice()
      • fill()
      • copyWithin()
    • 7.8.6. Array Searching and Sorting Methods
      • indexOf() and lastIndexOf()
      • includes()
      • sort()
      • reverse()
    • 7.8.7. Array to String Conversions
    • 7.8.8. Static Array Functions
  • 7.9. Array-Like Objects
  • 7.10. Strings as Arrays
  • 7.11. Summary
• 8. Functions
  • 8.1. Defining Functions
    • 8.1.1. Function Declarations
    • 8.1.2. Function Expressions
    • 8.1.3. Arrow Functions
    • 8.1.4. Nested Functions
  • 8.2. Invoking Functions
    • 8.2.1. Function Invocation
    • 8.2.2. Method Invocation
    • 8.2.3. Constructor Invocation
    • 8.2.4. Indirect Invocation
    • 8.2.5. Implicit Function Invocation
  • 8.3. Function Arguments and Parameters
    • 8.3.1. Optional Parameters and Defaults
    • 8.3.2. Rest Parameters and Variable-Length Argument Lists
    • 8.3.3. The Arguments Object
    • 8.3.4. The Spread Operator for Function Calls
    • 8.3.5. Destructuring Function Arguments into Parameters
    • 8.3.6. Argument Types
  • 8.4. Functions as Values
    • 8.4.1. Defining Your Own Function Properties
  • 8.5. Functions as Namespaces
  • 8.6. Closures
  • 8.7. Function Properties, Methods, and Constructor
    • 8.7.1. The length Property
    • 8.7.2. The name Property
    • 8.7.3. The prototype Property
    • 8.7.4. The call() and apply() Methods
    • 8.7.5. The bind() Method
    • 8.7.6. The toString() Method
    • 8.7.7. The Function() Constructor
  • 8.8. Functional Programming
    • 8.8.1. Processing Arrays with Functions
    • 8.8.2. Higher-Order Functions
    • 8.8.3. Partial Application of Functions
    • 8.8.4. Memoization
  • 8.9. Summary
• 9. Classes
  • 9.1. Classes and Prototypes
  • 9.2. Classes and Constructors
    • 9.2.1. Constructors, Class Identity, and instanceof
    • 9.2.2. The constructor Property
  • 9.3. Classes with the class Keyword
    • 9.3.1. Static Methods
    • 9.3.2. Getters, Setters, and other Method Forms
    • 9.3.3. Public, Private, and Static Fields
    • 9.3.4. Example: A Complex Number Class
  • 9.4. Adding Methods to Existing Classes
  • 9.5. Subclasses
    • 9.5.1. Subclasses and Prototypes
    • 9.5.2. Subclasses with extends and super
    • 9.5.3. Delegation Instead of Inheritance
    • 9.5.4. Class Hierarchies and Abstract Classes
  • 9.6. Summary
• 10. Modules
  • 10.1. Modules with Classes, Objects, and Closures
    • 10.1.1. Automating Closure-Based Modularity
  • 10.2. Modules in Node
    • 10.2.1. Node Exports
    • 10.2.2. Node Imports
    • 10.2.3. Node-Style Modules on the Web
  • 10.3. Modules in ES6
    • 10.3.1. ES6 Exports
    • 10.3.2. ES6 Imports
    • 10.3.3. Imports and Exports with Renaming
    • 10.3.4. Re-Exports
    • 10.3.5. JavaScript Modules on the Web
    • 10.3.6. Dynamic Imports with import()
    • 10.3.7. import.meta.url
  • 10.4. Summary
• 11. The JavaScript Standard Library
  • 11.1. Sets and Maps
    • 11.1.1. The Set Class
    • 11.1.2. The Map Class
    • 11.1.3. WeakMap and WeakSet
  • 11.2. Typed Arrays and Binary Data
    • 11.2.1. Typed Array Types
    • 11.2.2. Creating Typed Arrays
    • 11.2.3. Using Typed Arrays
    • 11.2.4. Typed Array Methods and Properties
    • 11.2.5. DataView and Endianness
  • 11.3. Pattern Matching with Regular Expressions
    • 11.3.1. Defining Regular Expressions
      • Literal characters
      • Character classes
      • Repetition
      • Non-greedy repetition
      • Alternation, grouping, and references
      • Specifying match position
      • Flags
    • 11.3.2. String Methods for Pattern Matching
      • search()
      • replace()
      • match()
      • matchAll()
      • split()
    • 11.3.3. The RegExp Class
      • RegExp properties
      • test()
      • exec()
  • 11.4. Dates and Times
    • 11.4.1. Timestamps
    • 11.4.2. Date Arithmetic
    • 11.4.3. Formatting and Parsing Date Strings
  • 11.5. Error Classes
  • 11.6. JSON Serialization and Parsing
    • 11.6.1. JSON Customizations
  • 11.7. The Internationalization API
    • 11.7.1. Formatting Numbers
    • 11.7.2. Formatting Dates and Times
    • 11.7.3. Comparing Strings
  • 11.8. The Console API
    • 11.8.1. Formatted Output with Console
  • 11.9. URL APIs
    • 11.9.1. Legacy URL Functions
  • 11.10. Timers
  • 11.11. Summary
• 12. Iterators and Generators
  • 12.1. How Iterators Work
  • 12.2. Implementing Iterable Objects
    • 12.2.1. Closing an Iterator: The Return Method
  • 12.3. Generators
    • 12.3.1. Generator Examples
    • 12.3.2. yield* and Recursive Generators
  • 12.4. Advanced Generator Features
    • 12.4.1. The Return Value of a Generator Function
    • 12.4.2. The Value of a yield Expression
    • 12.4.3. The return() and throw() Methods of a Generator
    • 12.4.4. A Final Note About Generators
  • 12.5. Summary
• 13. Asynchronous JavaScript
  • 13.1. Asynchronous Programming with Callbacks
    • 13.1.1. Timers
    • 13.1.2. Events
    • 13.1.3. Network Events
    • 13.1.4. Callbacks and Events in Node
  • 13.2. Promises
    • 13.2.1. Using Promises
      • Handling errors with Promises
    • 13.2.2. Chaining Promises
    • 13.2.3. Resolving Promises
    • 13.2.4. More on Promises and Errors
      • The catch and finally methods
    • 13.2.5. Promises in Parallel
    • 13.2.6. Making Promises
      • Promises based on other Promises
      • Promises based on synchronous values
      • Promises from scratch
    • 13.2.7. Promises in Sequence
  • 13.3. async and await
    • 13.3.1. await Expressions
    • 13.3.2. async Functions
    • 13.3.3. Awaiting Multiple Promises
    • 13.3.4. Implementation Details
  • 13.4. Asynchronous Iteration
    • 13.4.1. The for/await Loop
    • 13.4.2. Asynchronous Iterators
    • 13.4.3. Asynchronous Generators
    • 13.4.4. Implementing Asynchronous Iterators
  • 13.5. Summary
• 14. Metaprogramming
  • 14.1. Property Attributes
  • 14.2. Object Extensibility
  • 14.3. The prototype Attribute
  • 14.4. Well-Known Symbols
    • 14.4.1. Symbol.iterator and Symbol.asyncIterator
    • 14.4.2. Symbol.hasInstance
    • 14.4.3. Symbol.toStringTag
    • 14.4.4. Symbol.species
    • 14.4.5. Symbol.isConcatSpreadable
    • 14.4.6. Pattern-Matching Symbols
    • 14.4.7. Symbol.toPrimitive
    • 14.4.8. Symbol.unscopables
  • 14.5. Template Tags
  • 14.6. The Reflect API
  • 14.7. Proxy Objects
    • 14.7.1. Proxy Invariants
  • 14.8. Summary
• 15. JavaScript in Web Browsers
  • 15.1. Web Programming Basics
    • 15.1.1. JavaScript in HTML <script> Tags
      • Modules
      • Specifying script type
      • When scripts run: async and deferred
      • Loading scripts on demand
    • 15.1.2. The Document Object Model
    • 15.1.3. The Global Object in Web Browsers
    • 15.1.4. Scripts Share a Namespace
    • 15.1.5. Execution of JavaScript Programs
      • Client-side JavaScript threading model
      • Client-side JavaScript timeline
    • 15.1.6. Program Input and Output
    • 15.1.7. Program Errors
    • 15.1.8. The Web Security Model
      • What JavaScript cant do
      • The same-origin policy
      • Cross-site scripting
  • 15.2. Events
    • 15.2.1. Event Categories
    • 15.2.2. Registering Event Handlers
      • Setting event handler properties
      • Setting event handler attributes
      • addEventListener()
    • 15.2.3. Event Handler Invocation
      • Event handler argument
      • Event handler context
      • Handler return value
      • Invocation order
    • 15.2.4. Event Propagation
    • 15.2.5. Event Cancellation
    • 15.2.6. Dispatching Custom Events
  • 15.3. Scripting Documents
    • 15.3.1. Selecting Document Elements
      • Selecting elements with CSS selectors
      • Other element selection methods
      • Preselected elements
    • 15.3.2. Document Structure and Traversal
      • Documents as trees of nodes
    • 15.3.3. Attributes
      • HTML attributes as element properties
      • The class attribute
      • Dataset attributes
    • 15.3.4. Element Content
      • Element content as HTML
      • Element content as plain text
    • 15.3.5. Creating, Inserting, and Deleting Nodes
    • 15.3.6. Example: Generating a Table of Contents
  • 15.4. Scripting CSS
    • 15.4.1. CSS Classes
    • 15.4.2. Inline Styles
    • 15.4.3. Computed Styles
    • 15.4.4. Scripting Stylesheets
    • 15.4.5. CSS Animations and Events
  • 15.5. Document Geometry and Scrolling
    • 15.5.1. Document Coordinates and Viewport Coordinates
    • 15.5.2. Querying the Geometry of an Element
    • 15.5.3. Determining the Element at a Point
    • 15.5.4. Scrolling
    • 15.5.5. Viewport Size, Content Size, and Scroll Position
  • 15.6. Web Components
    • 15.6.1. Using Web Components
    • 15.6.2. HTML Templates
    • 15.6.3. Custom Elements
    • 15.6.4. Shadow DOM
      • Shadow DOM encapsulation
      • Shadow DOM slots and light DOM children
      • Shadow DOM API
    • 15.6.5. Example: a <search-box> Web Component
  • 15.7. SVG: Scalable Vector Graphics
    • 15.7.1. SVG in HTML
    • 15.7.2. Scripting SVG
    • 15.7.3. Creating SVG Images with JavaScript
  • 15.8. Graphics in a <canvas>
    • 15.8.1. Paths and Polygons
    • 15.8.2. Canvas Dimensions and Coordinates
    • 15.8.3. Graphics Attributes
      • Line styles
      • Colors, patterns, and gradients
      • Text styles
      • Shadows
      • Translucency and compositing
      • Saving and restoring graphics state
    • 15.8.4. Canvas Drawing Operations
      • Rectangles
      • Curves
      • Text
      • Images
    • 15.8.5. Coordinate System Transforms
      • Understanding transformations mathematically
      • Transformation example
    • 15.8.6. Clipping
    • 15.8.7. Pixel Manipulation
  • 15.9. Audio APIs
    • 15.9.1. The Audio() Constructor
    • 15.9.2. The WebAudio API
  • 15.10. Location, Navigation, and History
    • 15.10.1. Loading New Documents
    • 15.10.2. Browsing History
    • 15.10.3. History Management with hashchange Events
    • 15.10.4. History Management with pushState()
  • 15.11. Networking
    • 15.11.1. fetch()
      • HTTP status codes, response headers, and network errors
      • Setting request parameters
      • Setting request headers
      • Parsing response bodies
      • Streaming response bodies
      • Specifying the request method and request body
      • File upload with fetch()
      • Cross-origin requests
      • Aborting a request
      • Miscellaneous request options
    • 15.11.2. Server-Sent Events
    • 15.11.3. WebSockets
      • Creating, connecting, and disconnecting WebSockets
      • Sending messages over a WebSocket
      • Receiving messages from a WebSocket
      • Protocol negotiation
  • 15.12. Storage
    • 15.12.1. localStorage and sessionStorage
      • Storage lifetime and scope
      • Storage events
    • 15.12.2. Cookies
      • Reading cookies
      • Cookie attributes: lifetime and scope
      • Storing cookies
    • 15.12.3. IndexedDB
  • 15.13. Worker Threads and Messaging
    • 15.13.1. Worker Objects
    • 15.13.2. The Global Object in Workers
    • 15.13.3. Importing Code into a Worker
    • 15.13.4. Worker Execution Model
      • Errors in Workers
    • 15.13.5. postMessage(), MessagePorts, and MessageChannels
    • 15.13.6. Cross-Origin Messaging with postMessage()
  • 15.14. Example: The Mandelbrot Set
  • 15.15. Summary and Suggestions for Further Reading
    • 15.15.1. HTML and CSS
    • 15.15.2. Performance
    • 15.15.3. Security
    • 15.15.4. WebAssembly
    • 15.15.5. More Document and Window Features
    • 15.15.6. Events
    • 15.15.7. Progressive Web Apps and Service Workers
    • 15.15.8. Mobile Device APIs
    • 15.15.9. Binary APIs
    • 15.15.10. Media APIs
    • 15.15.11. Cryptography and Related APIs
• 16. Server-Side JavaScript with Node
  • 16.1. Node Programming Basics
    • 16.1.1. Console Output
    • 16.1.2. Command-Line Arguments and Environment Variables
    • 16.1.3. Program Life Cycle
    • 16.1.4. Node Modules
    • 16.1.5. The Node Package Manager
  • 16.2. Node Is Asynchronous by Default
  • 16.3. Buffers
  • 16.4. Events and EventEmitter
  • 16.5. Streams
    • 16.5.1. Pipes
    • 16.5.2. Asynchronous Iteration
    • 16.5.3. Writing to Streams and Handling Backpressure
    • 16.5.4. Reading Streams with Events
      • Flowing mode
      • Paused mode
  • 16.6. Process, CPU, and Operating System Details
  • 16.7. Working with Files
    • 16.7.1. Paths, File Descriptors, and FileHandles
    • 16.7.2. Reading Files
    • 16.7.3. Writing Files
    • 16.7.4. File Operations
    • 16.7.5. File Metadata
    • 16.7.6. Working with Directories
  • 16.8. HTTP Clients and Servers
  • 16.9. Non-HTTP Network Servers and Clients
  • 16.10. Working with Child Processes
    • 16.10.1. execSync() and execFileSync()
    • 16.10.2. exec() and execFile()
    • 16.10.3. spawn()
    • 16.10.4. fork()
  • 16.11. Worker Threads
    • 16.11.1. Creating Workers and Passing Messages
    • 16.11.2. The Worker Execution Environment
    • 16.11.3. Communication Channels and MessagePorts
    • 16.11.4. Transferring MessagePorts and Typed Arrays
    • 16.11.5. Sharing Typed Arrays Between Threads
  • 16.12. Summary
• 17. JavaScript Tools and Extensions
  • 17.1. Linting with ESLint
  • 17.2. JavaScript Formatting with Prettier
  • 17.3. Unit Testing with Jest
  • 17.4. Package Management with npm
  • 17.5. Code Bundling
  • 17.6. Transpilation with Babel
  • 17.7. JSX: Markup Expressions in JavaScript
  • 17.8. Type Checking with Flow
    • 17.8.1. Installing and Running Flow
    • 17.8.2. Using Type Annotations
    • 17.8.3. Class Types
    • 17.8.4. Object Types
    • 17.8.5. Type Aliases
    • 17.8.6. Array Types
    • 17.8.7. Other Parameterized Types
    • 17.8.8. Read-Only Types
    • 17.8.9. Function Types
    • 17.8.10. Union Types
    • 17.8.11. Enumerated Types and Discriminated Unions
  • 17.9. Summary
• Index

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