How would you implement a Library System using advanced JavaScript features?

An advanced JavaScript Library System uses modern features like classes, modules, and localStorage for state management, enabling organized, reusable, and scalable code.

Implement core entities (books, users) as classes, use modules to separate concerns, and manage data with localStorage or IndexedDB for persistence. Incorporate event-driven UI updates and validation for a smooth user experience.

Code

class Book {
  constructor(title, author) {
    this.title = title;
    this.author = author;
  }
}
class Library {
  constructor() {
    this.books = JSON.parse(localStorage.getItem('books')) || [];
  }
  addBook(book) {
    this.books.push(book);
    localStorage.setItem('books', JSON.stringify(this.books));
  }
}
const lib = new Library();
lib.addBook(new Book('1984', 'Orwell'));