ES2015 - Destructuring object in argument list

gistfile1.js

function foo({movieCount}){
  console.log(movieCount);
  //modify provided obj? no way
  movieCount = 0;
}


function oldFoo(obj){
  console.log(obj.movieCount);
  //modify provided obj? yes it's possible and dangerous
  obj.movieCount = 0;
}


let obj = { id: 5, name: 'John Hughes', movieCount: 5};
foo(obj);
oldFoo(obj);
console.log(obj);