gistfile1.rb

class RPSLS
    TYPES = ["Rock", "Paper", "Scissors", "Lizard", "Spock"]

    RESOLVER = { "Rock" => ["Scissors", "Lizard"],
                 "Paper" => ["Rock", "Spock"], 
                 "Scissors" => ["Paper", "Lizard"],
                 "Lizard" => ["Paper", "Spock"],
                 "Spock" => ["Scissors", "Rock"] }

    def self.get_type(type)
        type = TYPES[type] if type.is_a? Fixnum
        type
    end 

    def self.resolve(first, second)
        first = get_type(first) 
        second = get_type(second) 

        if first == second
            return "tie"
        end

        if RESOLVER[first].include?(second)
            puts(first + " beats " + second)
            return "first"
        else
            puts(first + " loses to " + second)
            return "second"
        end 
    end 

end

>> score = Hash.new(0)
=> {}
>> 10.times { |i| score[RPSLS.resolve(rand(5), rand(5))] += 1 }
Rock beats Lizard
Paper loses to Scissors
Lizard loses to Scissors
Spock loses to Lizard
Lizard loses to Rock
Scissors beats Lizard
Spock loses to Lizard
Rock beats Lizard
=> 10
>> RPSLS.resolve("Rock", "Spock")
Rock loses to Spock
=> "second"
>>