https://www.codecademy.com/courses/introduction-to-javascript/projects/build-a-library
Hello guys i was able to complete my library project but console returns
true
NaN
true
NaN
and i found out my subclass appear in red instead of blue(Book and Movie wont turn blue) which i identified after watching the project video. My work looked ok comparing it to the video.
Please someone should help me figure out the problem
this is what i did…
class Media {
constructor(title) {
this._name = title;
this._isCheckedOut = false;
this._ratings = [];
}
get title() {
return this._title;
}
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() {
let sum = this.ratings.reduce(function(a, b) {
a + b;
})
return sum / this.ratings.length;
}
addRating(value) {
this._ratings.push(value);
}
}
class Book extends Media {
constructor(title, author, pages) {
super(title);
this._author = author;
this._pages = pages;
}
get author() {
return this._author;
}
get pages() {
return this._pages;
}
}
class Movie extends Media {
constructor(title, director, 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();
console.log(historyOfEverything.isCheckedOut);
historyOfEverything.addRating(4);
historyOfEverything.addRating(5);
historyOfEverything.addRating(5);
console.log(historyOfEverything.getAverageRating());
const speed = new Movie(‘Speed’, ‘Jan de Bont’, 116);
speed.toggleCheckOutStatus();
console.log(speed.isCheckedOut);
speed.addRating(1);
speed.addRating(1);
speed.addRating(5);
console.log(speed.getAverageRating());