HW impossibility?: “Create a rock paper scissors program in ruby WITHOUT using conditionals”

Question

I\'m in an introductory software development class, and my homework is to create a rock paper scissors program that takes two arguments (rock, paper), etc, and returns the arg t

Answer 1

WINNAHS = [[:rock, :scissors], [:scissors, :paper], [:paper, :rock]]

def winner(p1, p2)
  (WINNAHS.include?([p1,p2]) && p1) || (WINNAHS.include?([p2,p1]) && p2) || :tie
end

winner(:rock, :paper)        #=> :paper 
winner(:scissors, :paper)    #=> :scissors 
winner(:scissors, :scissors) #=> :tie