Interesting interview questions

var x = 1;

//  If function parameters have default values , The parameter itself forms a scope , This scope is used to save the value of the parameter 
function foo(
  x,
  y = function () {
    
    x = 3;
    console.log(x);
  }
) {
    
  console.log(x);
  var x = 2;
  y();
  console.log(x);
}

foo();
console.log(x);

// undefined
// 3
// 2
// 1