rock_paper_scissors.rb

puts "Rock, Paper, Scissors, shoot!"
puts "(enter your choice)"
user_choice = gets.chomp.downcase

choices = ["rock", "paper", "scissors"]
computer_choice = choices[rand(3)]
puts "The computer chooses #{computer_choice}!"

puts "Tie!" if user_choice == computer_choice

if user_choice == "scissors" && computer_choice == "paper" ||
     user_choice == "rock" && computer_choice == "scissors"  ||
     user_choice == "paper" && computer_choice == "rock"
   puts "You win"
else
  puts "You lose!"
end