Challenge: Adding Methods to a Class

Task

You're working with a Book class that represents books in a library. Each book has a title, author, and genre. Your task is to add methods to this class to retrieve information and update the genre.

Complete the Method Definitions:
- In the existing Book class, add a method called getInfo that returns a string in the format: "Title by Author is a Genre book.";
- Add another method named updateGenre that takes one parameter, newGenre, and updates the book's genre property.
Test the Methods:
- An instance of Book named book1 has already been created with the values "The Great Gatsby", " F. Scott Fitzgerald", and "Classic";
- Call getInfo to log information about the book;
- Use updateGenre to change the genre to "Historical Fiction";
- Call getInfo again to confirm the genre update.


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class Book {
  constructor(title, author, genre) {
    this.title = title;
    this.author = author;
    this.genre = genre;
  }

  _____() {
    return `${this._____} by ${this._____} is a ${this._____} book.`;
  }

  _____(_____) {
    this._____ = _____;
  }
}

// Instance
const book1 = new Book('The Great Gatsby', 'F. Scott Fitzgerald', 'Classic');

// Test the methods
console.log(book1._____()); // Expected: The Great Gatsby by F. Scott Fitzgerald is a Classic book.
book1._____(_____); // Update genre
console.log(book1._____()); // Expected: The Great Gatsby by F. Scott Fitzgerald is a Historical Fiction book.

Define a method named getInfo in the Book class;
In the getInfo method, return a string that uses this.title, this.author, and this.genre;
Define a method named updateGenre that takes one parameter, newGenre;
In the updateGenre method, set this.genre to newGenre;
Call getInfo on book1 to log the initial information about the book;
Use updateGenre on book1 to change the genre to "Historical Fiction";
Call getInfo on book1 again to confirm the updated genre.


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class Book {
  constructor(title, author, genre) {
    this.title = title;
    this.author = author;
    this.genre = genre;
  }

  getInfo() {
    return `${this.title} by ${this.author} is a ${this.genre} book.`;
  }

  updateGenre(newGenre) {
    this.genre = newGenre;
  }
}

// Instance
const book1 = new Book('The Great Gatsby', 'F. Scott Fitzgerald', 'Classic');

// Test the methods
console.log(book1.getInfo()); // Output: The Great Gatsby by F. Scott Fitzgerald is a Classic book.
book1.updateGenre('Historical Fiction'); // Update genre
console.log(book1.getInfo()); // Output: The Great Gatsby by F. Scott Fitzgerald is a Historical Fiction book.

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Thanks for your feedback!

Section 1. Chapter 5