The syntax of JavaScript is the set of rules that define a correctly

structured JavaScript program.

The examples below make use of the console.log() function present in

most browsers for standard text output.

The JavaScript standard library lacks an official standard text output

function (with the exception of document.write). Given that JavaScript

is mainly used for client-side scripting within modern web browsers, and

that almost all Web browsers provide the alert function, alert can also

be used, but is not commonly used.

• Origins

• Basics

• Case sensitivity

• Whitespace and semicolons

• Comments

• Variables

• Scoping and hoisting

• Declaration and assignment

• Examples

• Primitive data types

• Undefined

• Number

• BigInt

• String

• Boolean

• Type conversion

• Symbol

• Native objects

• Array

• Date

• Error

• Math

• Regular expression

• Function

• Operators

• Arithmetic