Codecademy export

app.js

class Media {
  
  constructor(title) {
    this._title = title ;
    this._isCheckedOut = false;
    this._ratings = [];
  }
  get title() {
    return this._title;
  }
  get ratings () {
    return this._ratings;
  }

  get isCheckedOut() {
    return this._isCheckedOut;
  }

  toggleCheckOutStatus(){
    if(this.isCheckedOut === true){
      this.isCheckedOut = false;
    } else {
      this.isCheckedOut = true;
    }
  }

  getAverageRating() {
    let ratingsSum = this.ratings.reduce((currentSum,rating) => currentSum + rating);
    const lengthOfArray = this.ratings.length;
  let result = ratingsSum / lengthOfArray;
  return result;
}

  addRating(userRating){
      this.Ratings.push(userRating);
  }

  set isCheckedOut(newKey){
    this._isCheckedOut = newKey;
  }
}

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

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

  get runTime() {
    return this._runTime;
  }
}

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