JavaScript Variables

In JavaScript, variables are used to store data values. Variables are containers for storing information that can be referenced and manipulated in a program. JavaScript variables can hold various types of data, including numbers, strings, objects, arrays, functions, and more.

JavaScript Variables can be declared in 4 ways:

Automatically
Using var
Using let
Using const

Using the var keyword (older way, but still works)

Example

var myVariable = "Hello, CodeLines!";

Using the let keyword (introduced in ECMAScript 2015 (ES6)):

Example

 let myVariable = "Hello, CodeLines!";

Using the const keyword

(also introduced in ECMAScript 2015 (ES6)). This declares a constant variable, meaning its value cannot be reassigned:

Example

const PI = 3.14;