Build a Library Project: Books-‘N-Stuff carries three different types of media: books, CDs, and movies. In this project you will create a parent class named Media with three subclasses: Book, Movie, and CD.

Build a Library

// Created by Nalini Vo from Vietnam
// Requires:
**1. Book**
**Properties**: Author (string), title (string), pages (number), isCheckedOut (boolean, initially false), and ratings (array, initially empty).
**Getters**: All properties have a getter
**Methods**: .getAverageRating(), .toggleCheckOutStatus(), and .addRating()
**2. Movie**
**Properties**: Director (string), title (string), runTime (number), isCheckedOut (boolean, initially false), and ratings (array, initially empty)
**Getters**: All properties have a getter
**Methods**: .getAverageRating(), .toggleCheckOutStatus(), and .addRating()
**3. CD**
**Properties**: Artist (string), title (string), isCheckedOut (boolean, initially false), and ratings (array, initially empty), songs (array of strings)
**Getters**: All properties have a getter
**Methods**: .getAverageRating(), .toggleCheckOutStatus(), and .addRating()

// My Code as below: 

class Media {
  contructor(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(newisCheckedOut) {
    this._isCheckedOut = newisCheckedOut;
  }
  toggleCheckOutStatus () {
  this._isCheckedOut = !this._isCheckedOut;
  }
}

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;
  }
}

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

historyOfEverything.addRating = [4,5,5];
let numbers = historyOfEverything.addRating;
function getAverageRating(numbers) {
    return numbers.reduce((x,y) => x+y)/numbers.length
}
console.log(getAverageRating(numbers));

const speed = new Movie('Jan de Bont', 'Speed', 166);
console.log(speed);
speed.toggleCheckOutStatus();
console.log(speed.isCheckedOut);

speed.addRating = [1, 1, 5];
let speeds = speed.addRating;
function getAverageRating(speeds) {
    return speeds.reduce((x,y) => x+y)/speeds.length
}
console.log(getAverageRating(speeds));

class CD extends Media {
  constructor(artist, title) {
  super(title);
  this._artist  = artist;
  }
  get artist() {
    return this._artist;
  }
}

const shuffle = new CD('Nalini cutie', 'Minh bat chuoc loai Meow keu nha');
console.log(shuffle);
shuffle.toggleCheckOutStatus();
console.log(shuffle.isCheckedOut);

shuffle.addRating = [5,5,5];
let shuffles = shuffle.addRating;
function getAverageRating(shuffles) {
    return shuffles.reduce((x,y) => x+y)/shuffles.length
}
console.log(getAverageRating(shuffles));

https://www.codecademy.com/workspaces/643de19d14c65d59652fc19c