Variables (let, const, var)

Variables are containers for storing data values. JavaScript has three ways to declare variables: let, const, and var.

let - Block-Scoped Variables

Use let for variables that can be reassigned:

const - Constants

Use const for values that shouldn't change:

var - Legacy Variables

var is the old way to declare variables. Prefer let and const instead:

Naming Rules

Variable names must follow these rules:

Exercise: Create Variables

Create three variables and print them:

Exercise: Const vs Let

Use const for a fixed value and let for a changing value: