strategy_pattern.rb

class Poker
  def initialize(game)
    @game = game 
  end
 
  def evaluate_cards
      #...
      @game.primitive_operation
      #...
  end
end
 
class OmahaStrategy
  def primitive_operation
     #...
  end
end
 
class TexasStrategy
  def primitive_operation
     #...
  end
end
 
omaha_game = Poker.new(OmahaStrategy)
texas_game = Poker.new(TexasStrategy)