Scoping.js

//var function scoped
//let block scoped
function test1() {
  if (true) {
    var dummy1 = 'var belirtecinden'; 
    let dummy2 = 'let belirtecinden';
   
    console.log(dummy1);
    //output => var belirtecinden
    console.log(dummy2);
    //output => let belirtecinden

    var dummy1 = 'var yeniden tanımlama'; 
    let dummy2 = 'let yeniden tanımlama';
    //output => SyntaxError: Identifier 'dummy2' has already been declared
  }

  console.log(dummy1);
  //output => var belirtecinden
  console.log(dummy2);
  //output => ReferenceError: dummy2 is not defined 
}
test1();