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
  Promises

• Loops and iteration
  Copy Code

  <a href="javascript/Guide/Loops_and_iteration#for_statement">for</a><br>
     <a href="javascript/Guide/Loops_and_iteration#while_statement">while</a><br>
     <a href="javascript/Guide/Loops_and_iteration#do...while_statement">do...while</a><br>
     <a href="javascript/Guide/Loops_and_iteration#break_statement">break</a>/<a href="javascript/Guide/Loops_and_iteration#continue_statement">continue</a><br>
     <a href="javascript/Guide/Loops_and_iteration#for...in_statement">for..in</a><br>
     <a href="javascript/Guide/Loops_and_iteration#for...of_statement">for..of</a>

• 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

• Iterators and generators

  Iterators
  Iterables
  Generators

• Meta programming

  Proxy
  Handlers and traps
  Revocable Proxy
  Reflect