Web/JavaScript/Guide

The JavaScript Guide shows you how to use JavaScript and gives an overview of the language. If you need exhaustive information about a language feature, have a look at the JavaScript reference.

This Guide is divided into the following chapters.

Introduction

• About this guide
• About JavaScript
• JavaScript and Java
• ECMAScript
• Tools
• Hello World

Grammar and types

• Basic syntax & comments
• Declarations
• Variable scope
• Variable hoisting
• Data structures and types
• Literals

Control flow and error handling

• if...else
• switch
• try/catch/throw
• Error objects

Loops and iteration

• for
• while
• do...while
• continue/break
• for..in
• for..of

Functions

• Defining functions
• Calling functions
• Function scope
• Closures
• Arguments & parameters
• Arrow functions

Expressions and operators

• Assignment & Comparisons
• Arithmetic operators
• Bitwise & logical operators
• Conditional (ternary) operator

Numbers and dates

• Number literals
• Number object
• Math object
• Date object

Text formatting

• String literals
• String object
• Template literals
• Internationalization
• Regular Expressions

Indexed collections

• Arrays
• Typed arrays

Keyed collections

• Map
• WeakMap
• Set
• WeakSet

Working with objects

• Objects and properties
• Creating objects
• Defining methods
• Getter and setter

Details of the object model

• Prototype-based OOP
• Creating object hierarchies
• Inheritance

Promises

• Guarantees
• Chaining
• Error propagation
• Composition
• Timing

Iterators and generators

• Iterators
• Iterables
• Generators

Meta programming

• Proxy
• Handlers and traps
• Revocable Proxy
• Reflect

JavaScript modules

• Exporting
• Importing
• Default exports
• Renaming features
• Aggregating modules
• Dynamic module loading

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JavaScript Guide by Mozilla Contributors is licensed under CC-BY-SA 2.5.