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November 17, 2020 21:23
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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 = ('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(); | |
speed.addRating(1); | |
speed.addRating(1); | |
speed.addRating(5); | |
console.log(speed.getAverageRating()); |
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