Rock Paper Scissors in Ruby

rps.rb

MESSAGES = [
  "Choose your weapon",
  "Computer has chosen ",
  "TIE!",
  "Computer Wins",
  "You Win!"
]

def run
  puts MESSAGES[0]
  human = gets.chomp
  computer = ["rock", "paper", "scissors"].sample
  puts MESSAGES[1] + " " + computer

  if human == computer
    puts MESSAGES[2]
    run
  end

  case human
  when "rock"
    if computer == "paper"
      puts MESSAGES[3]
    else puts MESSAGES[4]
    end
  when "paper"
    if computer == "scissors"
      puts MESSAGES[3]
    else puts MESSAGES[4]
    end
  when "scissors"
    if computer == "rock"
      puts MESSAGES[3]
    else puts MESSAGES[4]
    end
  end

end

run