class School {
  constructor(name, level, numberOfStudents) {
    this._name = name;
    this._level = level;
    this._numberOfStudent = numberOfStudents;
  }
  get name() {
    return this._name;
  }
  get level() {
    return this._level;
  }
  get numberOfStudent() {
    return this._numberOfStudents;
  }
  set numberOfStudents(value) {
    if(value>isNan())
      console.log('Invalid input: numberOfStudents must be set to a Number.');
    else {
      this._numberOfStudents = value;
    }
  }
  quickFacts() {
    console.log(`${this.name} educates ${this.numberOfStudents} students at the ${this.level} school level.`)
  }
  static pickSubstituteTeacher(substituteTeachers) {
    const randInt = Math.floor(Math.random() + substituteTeachers.length);
    return substituteTeachers[randInt];
  }
}

class PrimarySchool extends School {
  constructor (name, numberOfStudents, pickupPolicy) {
    super(name, 'primary', numberOfStudents);
    this._pickupPolicy = pickupPolicy;
  }
  get pickupPolicy() {
    return this._pickupPolicy;
  }
}

class HighSchool extends School {
  constructor (name, numberOfStudents, sportsTeams) {
    super(name, 'high', numberOfStudents);
    this._sportsTeams = sportsTeams;
  }
  get sportsTeams() {
    return this._sportsTeams;
  }
}

const lorraineHansbury = new PrimarySchool('Lorraine Hansbury', 514, 'Students must be picked up by a parent, guardian, or a family member over the age of 13.');
lorraineHansbury.quickFacts();

const sub = School.pickSubstituteTeacher(['Jamal Crawford', 'Lou Williams', 'J. R. Smith', 'James Harden', 'Jason Terry', 'Manu Ginobli']);

const alSmith = new HighSchool('Al E. Smith', 415, ['Baseball', 'Basketball', 'Volleyball', 'Track and Field']);
console.log(alSmith.sportsTeams);