JAVASCRIPT

JavaScript block-scoped Variable9

// program showing block-scoped concept
// global variable
let a = 'Hello';

function greet() {

    // local variable
    let b = 'World';

    console.log(a + ' ' + b);

    if (b == 'World') {

        // block-scoped variable
        let c = 'hello';

        console.log(a + ' ' + b + ' ' + c);
    }

    // variable c cannot be accessed here
    console.log(a + ' ' + b + ' ' + c);
}

greet();

js make a variable block scoped

//The let and const keywords provide block-scoping
//Global scoped
let global = "I'm Global Scoped";

{
  //Block Scoped
  let a = "I'm Block Scoped";
  const b = "I'm Block Scoped";
  //Var is not block scoped(don't use var)
  var c = "I'm not Block Scoped";
}
//Variable a and b cannot be accessed as they are block scoped
console.log(a,b,c, global); //c and global can be accessed.