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.

Chapters

This Guide is divided into several 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
break/continue
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