rpsls.rb

PLAYS = {
  :scissors => [:paper, :lizard],
  :spock => [:scissors, :rock],
  :lizard => [:spock, :paper],
  :rock => [:lizard, :scissors],
  :paper => [:rock, :spock]
}

PLAYS.freeze

# example: rpsls(:lizard, :spock)
# returns winner as symbol, so the above would return :lizard
def rpsls(first, second)
  PLAYS[first].include?(second) ? first : second
end

# alternative version, which returns true if the
# first hand beats the second one, and false otherwise
def rpsls(first, second)
  PLAYS[first].include?(second)
end