Book Store (classes).js

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 (checkedOut) {
      this._isCheckedOut = checkedOut
    }
    getAverageRating () {
      let ratingsSum = this.ratings.reduce((accumulator, rating) => accumulator + rating)
      return ratingsSum/this.ratings.length
    }
    toggleCheckOutStatus () {
      this.isCheckedOut = !this.isCheckedOut
    }
    addRating (rating) {
      this.ratings.push(rating)
    }
  }
  class Book extends Media {
    constructor (author, title, pages) {
      super(title)
      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
    }
  }
  class CD extends Media {
    constructor (artist, title, songs) {
      super(title)
      this._artist = artist
      this._songs = songs
    }
    get artist () {
      return this._artist
    }
    get songs () {
      return this._songs
    }
  }
  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(5)
  console.log(historyOfEverything.getAverageRating())
  
  const speed = new Movie('Jan De Bont','Speed',116)
  speed.toggleCheckOutStatus()
  console.log(speed.isCheckedOut)
  speed.addRating(1)
  speed.addRating(1)
  speed.addRating(5)
  console.log(speed.getAverageRating())