class Creature {
 constructor(name, age) {
  this.name = name;
  this.age = age;
 }
}

class Human extends Creature {
 constructor(name, age, character) {
  super(name, age);
  this.character = character;
 }

 toString() {
  return `${this.name} (${this.age}) is a ${this.character} human`;
 }
};

console.log((new Human('Bob', 3, 'friendly')).toString());