Table of Contents

1. Challenge

   Introduction

   In this Guided Code Lab, you will construct an object oriented "library system" with Ruby.

   You will design three core classes — Book, Borrower, and Library — to simulate fundamental library operations, such as adding books, checking them out, and returning them.

   Class Structures

   Book Class

   • The Book class will represent individual books. Each book will have attributes such as title, author, and available.

   Borrower Class

   • The Borrower class will represent people who come to borrow books. Each Borrower will have attributes like name and borrowed_books, which will hold a list of books currently borrowed by them.

   Library Class

   • The Library class will act as the main hub where the operations take place. This class will have attributes such as book_list (a list of all books in the library) and methods to add books, check out books to borrowers, and receive returned books.

   Interactions Between Objects

   As you develop these classes, you'll also implement methods that allow these objects to interact. For example, when a borrower checks out a book, the availability of the book changes, and the book gets added to the borrower's borrowed_books list. Similarly, when a book is returned, its availability changes again, and it gets removed from the borrower's list.

   When you are finished, click Run inside the Terminal to see the application's output.

   If you're ready to get started, click the arrow below.

2. Challenge

   Creating a Book Class

   The Book class creates the books inside the library.

   Attributes:

   • title
   • author
   • availability

   Methods:

   • initialize

   All of your code will be written inside the book.rb file.

3. Challenge

   Creating a Borrower Class

   The Borrower class keeps track of who borrowed what books.

   Attributes:

   • name
   • borrowed_books

   Let's get started!

   All of your code will be written inside the borrower.rb file.

4. Challenge

   Creating a Library Class

   The Library class will let you keep track of the inventory and peform all of the typical tasks of a library such as add books, checkout books, return books, and see what books are available.

   Attributes:

   • inventory

   Methods:

   • initialize
   • add_book
   • checkout_book
   • return_book
   • list_available_books

   Let's get started!

   All of your code will be written inside the library.rb file.

5. Challenge

   Library Methods

   Overview

   This section will cover the helper methods inside the Library class that give the app it's main functionality.

   Methods:

   • add_book
   • checkout_book
   • return_book
   • list_available_books

   Let's get started!

   All of your code will be written inside the library.rb file.

6. Challenge

   Using the Library System

   If you're classes are complete, you can click Run in the Terminal to see the following output:

   The Great Gatsby has been checked out to John Doe.
   The Great Gatsby is not available.
   Available books:
   1984
   The Great Gatsby has been returned by John Doe.
   Available books:
   The Great Gatsby
   1984
   

   Feel free to experiment, add books, check them out, and use the methods from the Library class.