Cannot find error. Build A Library

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#1

Hey all. I am just working through the Javascript Syntax Part III - Build a Library Exercise but cannot figure out the error in the message below.

Javascript Syntax Part III - Build a Library
https://www.codecademy.com/paths/full-stack-engineer-career-path/tracks/fscp-22-javascript-syntax-part-iii/modules/wdcp-22-learn-javascript-syntax-classes/projects/build-a-library

/home/ccuser/workspace/learn-javascript-classes-build-a-library/app.js:48
super(title);
^
SyntaxError: Unexpected token ;
at createScript (vm.js:53:10)
at Object.runInThisContext (vm.js:95:10)
at Module._compile (module.js:543:28)
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)

class Media { //Start of Media Class Declaration
  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;
  }
  isCheckedOut(state) {
    this._isCheckedOut = state;
  }

  toggleCheckOutStatus() {
    if (this._isCheckedOut === true) {
      this._isCheckedOut = false;
    } else {
      this.isCheckedOut = true;
    }
  }

  getAverageRating() {
    const count = this._ratings.length;
    let sum = 0;
    for(let i=count-1; i>=0; i--) {
      sum += this._ratings[i];
    }
    return sum/count;
  }

  addRating(rating) {
    this._ratings.push(rating);
  }
} //End of Media Class Declaration


// Start of Book Class Declarations
class Book extends Media(author, title, pages){
  super(title);
  this._author = author;
  this._pages = pages;

  get author() {
    return this._author;
  }

 get pages() {
    return this._pages;
  }
} //End of Book Class Declarations

//Start of Movie Class Declarations
class Movie extends Media(director, title, runTime) {
  super(title);
  this._director = director;
  this._runTime = runTime;

  get director() {
    return this._director;
  }
  get runTime() {
    return this._runTime;
  }
} //End of Movie Class Declarations

//New Book A Short History of Nearly Everything
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());

//New Movie Speed
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());
#2

The Movie class and Book class do not have their constructors written properly:

You have:

class Book extends Media(author, title, pages){
  super(title);
  this._author = author;
  this._pages = pages;

but it should be

class Book extends Media{
  constructor(author, title, pages){
    super(title);
    this._author = author;
    this._pages = pages;
  }

And similarly for the Movie class’s constructor.

The constructor should look like a method (function).

#3

Thanks Jan.

Cheers.

Raymond Wood
Wood.raymond79@gmail.com