class HospitalEmployee {
  constructor(name) {
    this._name = name;
    this._remainingVacationDays = 20;
  }
  
  get name() {
    return this._name;
  }
  
  get remainingVacationDays() {
    return this._remainingVacationDays;
  }
  
  takeVacationDays(daysOff) {
    this._remainingVacationDays -= daysOff;
  }
}

class Nurse extends HospitalEmployee {
  constructor(name,certifications) {
    super(name);
    //super(remainingVacationDays);
    this._certifications = certifications;
  }
}
const nurseOlynyk = new Nurse('Olynyk', ['Trauma', 'Pediatrics']); 
console.log(nurseOlynyk._certifications);