Rock-Paper-Scissors

rps.rb

# rps = array of possible plays
rps = [:rock, :paper, :scissors]

puts "Player 1, choose your weapon: "
player1 = gets.chomp.downcase.to_sym
# accepts only valid input from player 1
if rps.include?(player1) == false
  puts "ERROR! INVALID INPUT!"

else 
  puts "Player 2, choose your weapon: "
  player2 = gets.chomp.downcase.to_sym
  #accepts only valid input from player 2
  if rps.include?(player2) == false
    puts "ERROR! INVALID INPUT!" 
  else
    # rules hash contains valid player 1 moves as the key
    # the values of the rules hash are a second hash
    # the value hashes contain valid player 2 moves as the key
    # corresponding hash values are the game results
    rules = {
      :rock => {:rock => :draw, :paper => :paper, :scissors => :rock},
      :paper => {:rock => :paper, :paper => :draw, :scissors => :scissors},
      :scissors => {:rock => :rock, :paper => :scissors, :scissors => :draw}
    }

    puts "Player 1 chose #{player1}."
    puts "Player 2 chose #{player2}."
    # determines the winner from the rules hash
    if rules[player1][player2] == :draw
      puts "Draw. You are equals...for now."
    elsif rules[player1][player2] == player1
      puts "Player 1 wins!"
    elsif rules[player1][player2] == player2
      puts "Player 2 wins!"
    else
      puts "This shouldn't have happened. How embarrassing!"
    end
    
  end
  
end

Nice! 🚀