I am working on the JavaScript project "Build a Library. I don’t know why line 72 is giving me an error. I tested the code in other development environments but I can’t figure it out.
The error message is:
/home/ccuser/workspace/learn-javascript-classes-build-a-library/app.js:72
historyOfEverything.toggleCheckOutStatus();
^
TypeError: historyOfEverything.toggleCheckOutStatus is not a function
at Object. (/home/ccuser/workspace/learn-javascript-classes-build-a-library/app.js:72:21)
at Module._compile (module.js:571:32)
at Object.Module._extensions…js (module.js:580:10)
at Module.load (module.js:488:32)
at tryModuleLoad (module.js:447:12)
at Function.Module._load (module.js:439:3)
at Module.runMain (module.js:605:10)
at run (bootstrap_node.js:427:7)
at startup (bootstrap_node.js:151:9)
at bootstrap_node.js:542:3
My current code is:
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() {
let ratingsSum = this.ratings.reduce((accumulator, rating) => accumulator + rating);
return ratingsSum / this.ratings.length;
}
addRating(value) {
this.ratings.push(value);
}
}
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();
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());