es6-classes-2.js

class Person {
  constructor(name) {
    this.name = name;
  }
  kek () {
    return 'lol kek';
  }
}

class GreatPerson extends Person {
  constructor (name) {
    super(name);
    this.kek();
  }
  kek () {
    console.log(`${super.kek()} cheburek`);
  }
}

let person = new GreatPerson('mda');