Build a Library

Language Help JavaScript
1

Hi.
build-a-library

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(newisCheckedOut) {
	this._isCheckedOut = newisCheckedOut;
	}
	toggleCheckOutStatus() {
	this._isCheckedOut = !this._isCheckedOut;
	}
  addRating(ratings){
    this._ratings.push(ratings);
  }
  getAverageRating() {
    let ratingsAverage = Math.round(this._ratings.reduce(function(a, b) {
      return a + b;
    }) / this._ratings.length);
    this._ratings = ratingsAverage;
  }  
}
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 Catalog extends Media {
	
}
const historyOfEverything = new Book('Bill Bryson','A Short History of Nearly Everything',544);
const hobbit = new Book('J.R. Tolkien','Hobbit',744);
console.log(hobbit.author)
historyOfEverything.toggleCheckOutStatus();
//console.log(historyOfEverything.isCheckedOut);
historyOfEverything.addRating(4);
historyOfEverything.addRating(5);
historyOfEverything.addRating(5);
historyOfEverything.getAverageRating();
//console.log(historyOfEverything.ratings);
const speed = new Media('Jan de Bont','Speed',116);
speed.toggleCheckOutStatus();
//console.log(speed.isCheckedOut);
speed.addRating(1);
speed.addRating(1);
speed.addRating(5);
speed.getAverageRating();

Can help with project Build a Library, step 25, last exercise - Create class called Catalog that holds all of the Media items in our library. How can I do this ?

1 Like
2

That’s one approach, though it could get messy. What if Media were to extend Catalog? It would make logical sense since a catalog could include all manner of entries, one subset of which would/could be Media.

P. S. Please include a link to this project. Thanks.

1 Like
3

Did so, the code below, is this the right option?
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(newisCheckedOut) {
this._isCheckedOut = newisCheckedOut;
}
toggleCheckOutStatus() {
this._isCheckedOut = !this._isCheckedOut;
}
addRating(ratings){
this._ratings.push(ratings);
}
getAverageRating() {
let ratingsAverage = Math.round(this._ratings.reduce(function(a, b) {
return a + b;
}) / this._ratings.length);
this._ratings = ratingsAverage;
}
}
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 Catalog {
constructor(mediaList){
this._MyCatalog = [mediaList];
}
get mediaList(){
return this._mediaList;
}
set mediaList(newMedialist){
this._MyCatalog.push(newMedialist);
}
}
const historyOfEverything = new Book(‘Bill Bryson’,‘A Short History of Nearly Everything’,544);
const hobbit = new Book(‘J.R. Tolkien’,‘Hobbit’,744);
historyOfEverything.toggleCheckOutStatus();
historyOfEverything.addRating(4);
historyOfEverything.addRating(5);
historyOfEverything.addRating(5);
historyOfEverything.getAverageRating();
const speed = new Media(‘Jan de Bont’,‘Speed’,116);
speed.toggleCheckOutStatus();
speed.addRating(1);
speed.addRating(1);
speed.addRating(5);
speed.getAverageRating();
const Test = new Catalog(historyOfEverything);
Test.mediaList = speed;
Test.mediaList = hobbit;
console.log(Test)

4

Please include a link to this project.

5

Link in first post , https://www.codecademy.com/courses/learn-javascript-classes/projects/build-a-library?course_redirect=introduction-to-javascript

6

Don’t know that there is just one right option. Does it work as you would expect? Did you write any methods on the new super class and test them in inherited Media and sub-Media instances to ensure they are passed down the inheritence chain?

8