class Media{
  constructor(title){
    this._title = title;
    this._isCheckedOut = false;
    this._ratings = [];
  }
  get title(){
    return this._title;
  }
  get isCheckedOut(){
    return this._isCheckedOut;
  }
  get ratings(){
    return this._ratings;
  }
  set isCheckedOut(checked){
   	this._isCheckedOut = checked;
  }
  toggleCheckOutStatus(){
		this._isCheckedOut = !this._isCheckedOut;
  }
  getAverageRating(){
    let lengthOfArray = this._ratings.length;
  	let result = this._ratings.reduce((accumulator, rating) => accumulator + rating, 0);
    return result/lengthOfArray;

  }
  addRating(newRating){
    this._ratings.push(newRating);
  }
}
//const newMedia = new Media('Jumanji', false, [5, 4, 5, 3, 2, 1,6, 7]);
//console.log(newMedia.getAverageRating());
//console.log(newMedia.isCheckedOut);

class Book extends Media{
   constructor(title, author, pages){
		   super(title);
     	 this._author = author;
     	 this._pages = pages;
   }
   get author(){
     return this._author;
   }
   get pages(){
     return this._pages;
   }

}
const historyOfEverything = new Book('Bill Bryson', 'A Short History of Nearly Everything', 544);
historyOfEverything.toggleCheckOutStatus();
console.log(historyOfEverything.isCheckedOut);
historyOfEverything.addRating(4);
historyOfEverything.addRating(5);
historyOfEverything.addRating(6);
console.log(historyOfEverything.getAverageRating());

class Movie extends Media{
  constructor(title, director, runTime){
    super(title);
    this._director = director;
    this._runTime = runTime;
  }
  get director(){
    return this._director;
  }
  get runTime(){
    return this._runTime;
  }
}

const speed = new Movie('Jan deBont', 'Speed', 116);
speed.toggleCheckOutStatus();
console.log(speed.isCheckedOut);
speed._ratings = [4, 3, 4];
//speed.addRating(1);
//speed.addRating(2);
//speed.addRating(3);
console.log(speed.getAverageRating());