Hackforge Academy

Explanation

let is a keyword introduced in ES6 used
to declare variables with block scope.

Code:

let name = "Praveen";
console.log(name);

Explanation

Variables declared with let are limited to the
block in which they are defined (inside {}
braces).

Code:

{
  let x = 10;
  console.log(x);
}
// console.log(x); // Error: x is not defined

Explanation

Variables declared with let can be reassigned with
a new value.

Code:

let count = 5;
count = 10;
console.log(count);

Explanation

You cannot redeclare a variable with let in
the same scope.

Code:

let age = 25;
// let age = 30; // Error: Identifier 'age' has already been declared

Explanation

var has function scope, while let has block
scope. let is safer and avoids scope-related issues.

Code:

if (true) {
  var a = 1;
  let b = 2;
}

console.log(a); // Works
// console.log(b); // Error

Explanation

Variables declared with let cannot be accessed before
their declaration due to the Temporal Dead Zone.

Code:

// console.log(x); // Error
let x = 10;
console.log(x);