Metaprogramming - Calculator Interface

calc_interface.rb

# Calc class
# my_calc = Calc.new
# my_calc.one.plus.one => 2
# my_calc.two.plus.one => 3

# my_calc.four.minus.one => 3

#my_calc.one => new_calc_object
#new_calc_object.plus => newer_calc_object
#newer_calc_object.one => 2

class Calc

  def initialize
    @operation = nil
    @first_number = nil
  end

  def handle_operation(value)
    if @operation
      return @first_number.send(@operation, value)
    else
      @first_number = value
      return self
    end
  end

  def one
    handle_operation(1)
  end

  def two
    handle_operation(2)
  end


  def plus
    @operation = "+"
    return self
  end

  def minus
    @operation = "-"
    return self
  end

  # def method_missing(name, args)
  #   puts "I don't know how to #{name} with #{args}"
  # end
end


# Fridge.limit(4).where(name: "blah").where(location: "boop").order(name: :desc)