Javascript Class extends parent class

class Book {//  w  w  w.ja va2  s  .c  om
    constructor (title, pages, isbn) {
        this.title = title;
        this.pages = pages;
        this.isbn = isbn;
    }
    printIsbn(){
        console.log(this.isbn);
    }
}

//inheritance
class ITBook extends Book {

    constructor (title, pages, isbn, technology) {
        super(title, pages, isbn);
        this.technology = technology;
    }

    printTechnology(){
        console.log(this.technology);
    }
}

let jsBook = new ITBook('Learning JS Algorithms', '200', '1234567890', 'JavaScript');

console.log(jsBook.title);
console.log(jsBook.printTechnology());