class GreatPerson extends Person {
  constructor(name, phrase) {
    super(name);
    this.phrase = phrase;
  }
  sayPhrase() {
    console.log(`${this.name} says: "${this.phrase}"`)
  }
}

const jane = new Person('Jane', 'Hello, World!');
jane.sayName(); // Person Jane said his name
jane.sayPhrase(); // Jane says: "Hello, World!"