Include for instance methods in Ruby - Mini Project: Build & Apply

Using Include for Instance Methods in Ruby

📖 Scenario: You are building a simple program to manage animals in a zoo. Some animals can make sounds, and you want to share this ability using a module.

🎯 Goal: Create a module with an instance method, include it in a class, and use the method from an instance of that class.

📋 What You'll Learn

Create a module named Sound with an instance method make_sound that returns the string "Roar!".

Create a class named Lion.

Include the Sound module inside the Lion class.

Create an instance of Lion and call the make_sound method.

Print the result of calling make_sound on the Lion instance.

💡 Why This Matters

🌍 Real World

Modules with instance methods let you share common behaviors across different classes, like animals making sounds in a zoo management system.

💼 Career

Understanding how to use modules and include them for instance methods is important for writing clean, reusable Ruby code in many software projects.

1

Create the Sound module with an instance method

Create a module called Sound with an instance method named make_sound that returns the string "Roar!".

Ruby

# Define the Sound module with make_sound method
# Your code here

Need a hint?

Use module Sound to start and define def make_sound inside it.

2

Create the Lion class and include the Sound module

Create a class called Lion and include the Sound module inside it.

Ruby

module Sound
  def make_sound
    "Roar!"
  end
end

# Define the Lion class and include Sound module
# Your code here

Need a hint?

Use class Lion and inside it write include Sound.

3

Create a Lion instance and call make_sound

Create a variable called simba and set it to a new instance of Lion. Then call the make_sound method on simba and store the result in a variable called sound.

Ruby

module Sound
  def make_sound
    "Roar!"
  end
end

class Lion
  include Sound
end

# Create simba as a Lion instance and call make_sound
# Your code here

Need a hint?

Use simba = Lion.new and then sound = simba.make_sound.

4

Print the sound made by simba

Print the value of the variable sound.

Ruby

module Sound
  def make_sound
    "Roar!"
  end
end

class Lion
  include Sound
end

simba = Lion.new
sound = simba.make_sound

# Print the sound variable
# Your code here

Need a hint?

Use puts sound to display the sound.