JavaScript Variable's

Variable

In JavaScript, a variable is a named container used to store data values

• Using var
• Using let
• Using const

Var:
The var keyword is used to declare a variable. It was the original way to declare variables in JavaScript and has specific characteristics

var x = 10;
var y= 20;
console.log(x); 
// Output: 10

Let

• The let keyword was introduced in ES6 (2015)
• Variables declared with let have Block Scope
• Variables declared with let must be Declared before use
• Variables declared with let cannot be Redeclared in the same scope

{
  let x = 2;
Console.log(x)
}
// x can NOT be used here

Const

• The const keyword was introduced in ES6 (2015)
• Variables defined with const cannot be Redeclared
• Variables defined with const cannot be Reassigned
• Variables defined with const have Block Scope

{
    const x = 10;
    console.log(x); 
// Output: 10
}
console.log(x);
 // ReferenceError: x is not defined