Module methods in Ruby - Mini Project: Build & Apply

Using Module Methods in Ruby

📖 Scenario: You are building a simple calculator program that can perform basic math operations. To keep the code organized, you will use a Ruby module to group the math methods.

🎯 Goal: Create a Ruby module named Calculator with methods for addition and subtraction. Then call these methods to perform calculations.

📋 What You'll Learn

Create a module named Calculator

Inside the module, define a method add that takes two numbers and returns their sum

Inside the module, define a method subtract that takes two numbers and returns their difference

Call the add and subtract methods from the Calculator module and print the results

💡 Why This Matters

🌍 Real World

Modules help organize related methods in Ruby programs, making code easier to maintain and reuse.

💼 Career

Understanding modules is important for Ruby developers to write clean, modular, and reusable code in real projects.

1

Create the Calculator module

Create a Ruby module called Calculator.

Ruby

# Create a module called Calculator
# Your code here

Need a hint?

Use the keyword module followed by the module name and end to define a module.

2

Add methods to the Calculator module

Inside the Calculator module, define a method called add that takes two parameters a and b and returns their sum. Also define a method called subtract that takes two parameters a and b and returns their difference.

Ruby

module Calculator
  # Define add method
  # Your code here
  # Define subtract method
  # Your code here
end

Need a hint?

Use def self.method_name to define module methods that can be called on the module itself.

3

Call the module methods

Call the add method from the Calculator module with arguments 10 and 5 and store the result in a variable called sum. Call the subtract method with arguments 10 and 5 and store the result in a variable called difference.

Ruby

module Calculator
  def self.add(a, b)
    a + b
  end

  def self.subtract(a, b)
    a - b
  end
end

# Call add and subtract methods
# Your code here

Need a hint?

Call module methods using the module name followed by a dot and the method name.

4

Print the results

Print the values of sum and difference variables using two separate puts statements.

Ruby

module Calculator
  def self.add(a, b)
    a + b
  end

  def self.subtract(a, b)
    a - b
  end
end

sum = Calculator.add(10, 5)
difference = Calculator.subtract(10, 5)

# Print sum and difference
# Your code here

Need a hint?

Use puts to print each variable on its own line.