class Book {

constructor(title, author, year) {

this.title = title;

this.author = author;

this.year = year;

}

getSummary() {

return `${this.title} was written by ${this.author} in ${this.year}.`;

}

getAge() {

const years = new Date().getFullYear() - this.year;

return `${this.title} is ${years} years old.`;

}

revise(newYear) {

this.year = newYear;

this.revised = true;

}

static topBookStore() {

return 'Barnes & Noble';

}

}

// Instantiate an Object

const book1 = new Book('Book One', 'John Doe', 2013);

const book2 = new Book('Book Two', 'Jane Doe', 2016);

console.log(book1);

console.log(book1.getSummary());

console.log(book2.getSummary());

console.log(book2);

book2.revise(2018);

console.log(book2);

console.log(book2.getAge());

console.log(Book.topBookStore());