lee.rb

class WrongNumberOfPlayersError < StandardError ; end
class NoSuchStrategyError < StandardError ; end
module Lee
  
  def self.palindrome?(str)
    word = str.split(/\W+/).join("").downcase
    str = word
    word == str.reverse
  end

  def self.count_words(str)
    str.downcase.split(/\W+/).reduce({}) do |result, element| 
      result[element] = result.has_key?(element) ? result[element] + 1 : 1
      result
    end
  end

  def self.rps_game_winner(game)
    raise WrongNumberOfPlayersError unless game.size == 2
    winner = []
    game.each_with_index do |item, idx| 
      raise NoSuchStrategyError unless item[1] =~ /P|S|R/
      if item[1] == 'S' && game[idx+1][1] == 'P'
        winner = item
      end
    end
    winner
  end

end