JavaScript Variables

A variable is a container that stores data which you can use and manipulate later.
It is to be understood as a labelled box.

Example of VariableHere Hello, World! is stored in a box labelled message.

Declaration and Scope of Variables

var
- Reassign: Yes ✅
- Scope: Function-scoped
- Hoisting: Yes ✅
- Best Use: Avoid (legacy code) ❌

let
- Reassign: Yes ✅
- Scope: Block-scoped
- Hoisting: No ❌
- Best Use: Use for changeable variables ✅

const
- Reassign: No ❌
- Scope: Block-scoped
- Hoisting: No ❌
- Best Use: Use when value should not change ✅

We generally use let and const in modern JavaScript.

Usage of let
Usage of const