Random House using strategy pattern

gistfile1.txt

class House

  attr_accessor :os

  def initialize(os=DefaultOrderingStrategy.new)
    @os = os
  end

  def recite
    (1..actors.length).map { |i| line(i) }.join("\n")
  end

  def line(number)
    "This is %s.\n" % [actors.last(number).zip(actions.last(number)).join(' ')]
  end

  private


  def actors
    @actors ||= os.order([
      'the horse and the hound and the horn',
      'the farmer sowing his corn',
      'the rooster that crowed in the morn',
      'the priest all shaven and shorn',
      'the man all tattered and torn',
      'the maiden all forlorn',
      'the cow with the crumpled horn',
      'the dog',
      'the cat',
      'the rat',
      'the malt',
      'the house'
    ])
  end

  def actions
    @actions ||= os.order([
      'that belonged to',
      'that kept',
      'that woke',
      'that married',
      'that kissed',
      'that milked',
      'that tossed',
      'that worried',
      'that killed',
      'that ate',
      'that lay in',
      'that Jack built'
    ])
  end

end


class DefaultOrderingStrategy
  def order(array)
    array
  end
end

class RandomOrderingStrategy
  def order(array)
    array.shuffle
  end
end