SOURCE

{
  class Parent {
    constructor(name = 'c1') {
      this.name = name;
    }
  }
  let v_parent = new Parent('v');
  console.log(v_parent);
} {
  class Parent {
    constructor(name = 'c2') {
      this.name = name;
    }
  }
  class Child extends Parent {
    constructor(name = 'child') {
      super(name);
      this.type = 'child';
    }
  }
  console.log(new Child());
} {
  class Parent {
    constructor(name = 'c2') {
      this.name = name;
    };
    get longName() {
      return 'mk' + this.name;
    }
    set longName(value){
      this.name = value;
      
    }
  }
  
  let p = new Parent();
  console.log(p.longName);
  p.longName = 'hello';
  console.log(p.longName);

}