To_s method for string representation in Ruby - Mini Project: Build & Apply

To_s method for string representation

📖 Scenario: You are creating a simple Ruby program to represent a book with its title and author. You want to make it easy to see the book's details as a string.

🎯 Goal: Build a Ruby class Book that stores a title and author, and customize its string representation using the to_s method.

📋 What You'll Learn

Create a class called Book with title and author attributes

Add an initializer method to set title and author

Define a to_s method that returns a string like "Title: The Hobbit, Author: J.R.R. Tolkien"

Create an instance of Book with specific title and author

Print the instance to show the custom string representation

💡 Why This Matters

🌍 Real World

Customizing the string representation of objects helps make debugging and displaying information clearer and more user-friendly.

💼 Career

Understanding how to override <code>to_s</code> is useful for Ruby developers to create readable outputs for objects in logs, user interfaces, and reports.

1

Create the Book class with attributes

Create a class called Book with an initialize method that takes title and author as parameters and sets them as instance variables.

Ruby

class Book
  # Your code here
end

Need a hint?

Use def initialize(title, author) and set @title = title and @author = author.

2

Add the to_s method for string representation

Inside the Book class, define a to_s method that returns a string in the format: "Title: #{@title}, Author: #{@author}".

Ruby

class Book
  def initialize(title, author)
    @title = title
    @author = author
  end

  # Your code here
end

Need a hint?

Define def to_s and return the formatted string using "Title: #{@title}, Author: #{@author}".

3

Create a Book instance

Create a variable called my_book and assign it a new Book object with the title "The Hobbit" and author "J.R.R. Tolkien".

Ruby

class Book
  def initialize(title, author)
    @title = title
    @author = author
  end

  def to_s
    "Title: #{@title}, Author: #{@author}"
  end
end

# Your code here

Need a hint?

Use my_book = Book.new("The Hobbit", "J.R.R. Tolkien") to create the instance.

4

Print the Book instance

Use puts my_book to print the string representation of the my_book object.

Ruby

class Book
  def initialize(title, author)
    @title = title
    @author = author
  end

  def to_s
    "Title: #{@title}, Author: #{@author}"
  end
end

my_book = Book.new("The Hobbit", "J.R.R. Tolkien")

# Your code here

Need a hint?

Use puts my_book to display the book details.