function Cat(name) {
   this.name = name;
   console.log('Create cat ' + name);
}
Cat.prototype.meow = function meow() {
 console.log(this.name + ' meow !');
}
let cat = new Cat('Hector');
cat.meow();

function Dog(name) {
   this.name = name;
   console.log('Create dog ' + name);
}

class SuperCat extends Cat {
 constructor(name) {
   super(name);
   this.supperpower = 'ROAR';
 }

   meow() {
       super.meow();
   }
}