BuildALibrary.js

/*Build a Library
Congratulations, you’ve become head librarian at your local Books-‘N-Stuff, 
which is in dire need of your help. They’re still using index cards to organize
 their content! Yikes.

But no matter, you know some JavaScript, so let’s get to work modernizing your new digs.

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. These three subclasses have the following properties and methods:


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()

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()

CD
Properties: _artist (string), _title (string),
 _isCheckedOut (boolean, initially false), _ratings (array, initially empty),
  and _songs (array of strings)

Getters: all properties have a getter
Methods: .getAverageRating(), .toggleCheckOutStatus(), and .addRating() */




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(value){
     this._isCheckedOut= value;
  }

  toggleCheckOutStatus(){
        this._isCheckedOut = !this._isCheckedOut;
}
getAverageRating() {
  const sum = this.ratings.reduce((accumulator, rating) => {
    return accumulator + rating;
  }, 0);

  return sum / this.ratings.length;
}
addRating(ratingvalue){
  if (ratingvalue >= 1 && ratingvalue <= 5) {
    this._ratings.push(ratingvalue);
  }
}
}
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);

// historyOfEverything.toggleCheckOutStatus();

// historyOfEverything.addRating(4); 
// historyOfEverything.addRating(5); 
// historyOfEverything.addRating(5); 
// console.log(`History Book Rating => ${historyOfEverything.getAverageRating()}`);
// console.log(historyOfEverything);



// const speed = new Movie ('Jan de Bont', 'Speed', 116);
// speed.toggleCheckOutStatus();
// speed.addRating(1); 
// speed.addRating(1); 
// speed.addRating(5);
// console.log(`Average Rating for Speed => ${speed.getAverageRating()}`);
// console.log(`Average Rating for Speed => ${speed.getAverageRating()}`);

// console.log(speed);

/*1. Let’s start by making a parent class for our Book, CD, and Movie classes.
Create an empty class called Media. 

2. Inside the Media class, create an empty constructor() method that takes one parameter.
This argument will set the one property that is in all three subclasses of Media,
 and does not have a default value.

3.Inside the constructor(), set the values for Media properties that Book, CD, and 
Movie share.

4.Create title(), isCheckedOut(), and ratings() getter methods. 
Each getter should return the value saved to the corresponding property from the
 previous step.

5.Create an isCheckedOut() setter that updates the _isCheckedOut property.

6.Under your getters, create a method called toggleCheckOutStatus() that changes the 
value saved to the _isCheckedOut property.

If the current value is true, then change it to false. If the current value is false,
 then change it to true.

7.Under .toggleCheckOutStatus(), create a method named getAverageRating(). Return the average value of the ratings array.
Use the reduce() method to find the sum of the _ratings array. Divide this sum by the length of the _ratings array, and return the result. Use the ratings getter to access the underlying _ratings array.
Take a look at the hint if you need help with the syntax for summing an array of numbers with .reduce().

8.Let’s add a method named addRating() that accepts one argument, then uses .push() and the ratings getter to add it to the end of the _ratings array.

9.Next, we’ll build a Book class that extends Media. If you feel comfortable building the Book class on your own, give it a shot. If not, use the steps below to help you along the way.

Whether you want to follow the steps or not, use the list of properties, getters, and methods as a reference.

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()
Create an empty Book class that extends Media.

10.
Inside the Book class, create a constructor() that accepts three arguments. These arguments are used to set properties that do not have default values.

11.
Call super() on the first line of the Book class constructor() method. Pass any arguments that the parent constructor uses.

12.
Use the remaining arguments to set the _author and _pages properties in Book.

13.
Since our Book class inherits Media class properties and getters, we only need to create two new getters in the Book class.

Add two new getters to the Book class. Each getter should return the value saved to its matching property.

14.
Let’s see if you can create an entire Movie class using only the property, getter, and method specifications below:

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()
Take a look at the Hint to see step-by-step instructions.

15.
Create a Book instance with the following properties:

Author: 'Bill Bryson'
Title: 'A Short History of Nearly Everything'
Pages: 544
Save the instance to a constant variable named historyOfEverything.

16.
Call .toggleCheckOutStatus() on the historyOfEverything instance.

17.
Log the value saved to the _isCheckedOut property in the historyOfEverything instance using the isCheckedOut getter.

18.
Call .addRating() three times on historyOfEverything with inputs of 4, 5, and 5.

19.
Call .getAverageRating() on historyOfEverything. Log the result to the console.

20.
Create a Movie instance with the following properties:

Director: 'Jan de Bont'
Title: 'Speed'
Runtime: 116
Save the instance to a constant variable named speed.

21.
Call .toggleCheckOutStatus() on the speed instance.

22.
Log the value saved to the isCheckedOut property in the speed instance.

23.
Call .addRating() three times on speed with inputs of 1, 1, and 5.

24.
Call .getAverageRating() on speed. Log the result to the console.

25.


If you would like to continue working on this project, we have listed some avenues to
 build on your existing progress.

Add more properties to each class (movieCast, songTitles, etc.), and getters to access them.
Create a CD class that extends Media.
In .addRating(), make sure the input is between 1 and 5.
Create a method called shuffle for the CD class. The method returns a randomly sorted array of all the songs in the songs property.
Create a class called Catalog that holds all of the Media items in our library.
*/