class A {

  constructor(name){
    this.name = name;
  }

  static create(name){
    return new this(name);
  }

  static create2(name){
    return new A(name);
  }

  toString() {
    return this.name;
  }

}

class B extends A {
  constructor(name){
    super(name);
    this.name = 'B:' + this.name;
  }

}



let a1 = A.create('luis');

let a2 = new A('luis');

let a3 = A.create2('luis');


console.log(a1.toString(), a2.toString(), a3.toString());

let b1 = B.create('jorge');

let b2 = new B('jorge');

let b3 = B.create2('jorge');


console.log(b1.toString(), b2.toString(), b3.toString());