What is the Difference Between Let, Var, and Const?

JavaScript has three ways to declare variables. Understanding the difference is crucial for clean code.

1. Var (The Old Way)

Function scoped. Can be redeclared. Avoid using this in modern code.

2. Let (The Modern Way)

Block scoped. Can be updated but not redeclared in the same scope. Use this for loops.

3. Const (The Safe Way)

Block scoped. Cannot be updated or redeclared. Use this by default for values that won't change.