game.rb

# Create an array of valid hands
#                  0      1      2
#                 -3     -2     -1
valid_hands = %w[rock scissors paper]
user_hand = nil

# Get user input for a hand
loop do
  puts "Choose your hand: #{valid_hands.join(' | ')}"
  puts "<To exit just press enter.>"
  user_hand = gets.chomp
  break if user_hand.empty?

  until valid_hands.include?(user_hand)
    puts "That's not a valid hand!" 
    user_hand = gets.chomp
  end

  # Get random pc hand from the valid 
  pc_hand = valid_hands.sample
  puts "PC chose #{pc_hand}"
  # What determines a winning hand?
  if (user_hand == "rock" && pc_hand == "scissors") ||
     (user_hand == "scissors" && pc_hand == "paper") ||
     (user_hand == "paper" && pc_hand == "rock")
    puts "You win"
  elsif pc_hand == user_hand
    puts"Draw"
  else
    puts"You lose"
  end
end
puts "Goodbye!"