RiverGlide/CukeSalad

module Calculations
  
  def follow_the_steps_for sum
    enter_numbers_and_operators_for sum
  end
  
  def enter_numbers_and_operators_for sum
    operators = Calculator::OPERATIONS.invert
    sum.each do | token |
      enter token.to_i if token =~ /\d+/
      press operators[token] if operators.include? token
    end
  end
end