# Creating a mixin using a module includes the code in a module inside a class and
# gives you a way of inheriting from multiple modules.
module Adder
def add(operand_one, operand_two)
return operand_one + operand_two
end
end
module Subtracter
def subtract(operand_one, operand_two)
return operand_one - operand_two
end
end
class Calculator
include Adder
include Subtracter
end
calculator = Calculator.new()
puts "2 + 3 = " + calculator.add(2, 3).to_s