Rock, Paper, Scissors Game

app.rb

possible_moves = ["rock", "paper", "scissors"]
winner = { "rock" => "scissors", "paper" => "rock", "scissors" => "paper" }         # key is winner, value is loser

print "Do you want to play Rock, Paper, Scissors? (yes/no) "
action = gets.chomp.downcase

while action != "no" do
  puts "Rock... Paper... Scissors... Chute!"

  print "Player 1 Choice: "                                   # Players choose weapons
  player_one_move = gets.chomp.to_s.downcase

  until possible_moves.include?(player_one_move) do           # if choice isn't valid, try again.
    puts "Answer not valid."
    print "Player 1 Choice: "
    player_one_move = gets.chomp.to_s.downcase
  end

  print "Player 2 Choice: "
  player_two_move = gets.chomp.to_s.downcase

  until possible_moves.include?(player_two_move) do
    puts "Answer not valid."
    print "Player 2 Choice: "
    player_two_move = gets.chomp.to_s.downcase
  end

  if player_two_move == player_one_move                       # if each player select the same move, it is a tie.
    puts "Draw"
  elsif winner.fetch(player_one_move) == player_two_move      # elsif player_two_move is player_one_move's value in winner hash, Player 1 wins.
    puts "Player 1 Wins"
  else                                                        # else, Player 2 Wins!
    puts "Player 2 Wins"
  end

  print "Again? (yes/no) "
  action = gets.chomp.downcase
end