gistfile1.txt

def do_something
  action = case
    when self.play?: true ? 'play football' : 'do nothing'
    when self.work?: 'go to work'
    when self.sleep?: 'sleep'
    else: 'What?'
  end
  return action
end

  def play?; false; end
  def work?; true; end
  def sleep?; false; end

object.do_something  --> "What?"