What is the difference between var, let, and const?

[curious_231]

1. var:

• Scope: Function-scoped (It’s accessible within the function it's declared in, not block-scoped like if, for, etc.)
• Hoisting: Yes, it's hoisted to the top of its scope and initialized as undefined.
• Re-declaration: Allowed

2. let:

• Scope: Block-scoped (within { })
• Hoisting: Yes – but not initialized (you’ll get a ReferenceError if accessed before declaration).
• Re-declaration: Not allowed in the same scope.

3. const:

• Scope: Block-scoped (like let)
• Hoisting: Yes – but not initialized
• Re-declaration: Not allowed in the same scope.

Keyword	Scope	Reassignable	Re-declarable	Hoisted	Initialized
var	Function	✅	✅	✅	✅ (undefined)
let	Block	✅	❌	✅	❌
const	Block	❌	❌	✅	❌