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Rock Paper Scissors

Mix.install([
  {:jason, "~> 1.4"},
  {:kino, "~> 0.9", override: true},
  {:youtube, github: "brooklinjazz/youtube"},
  {:hidden_cell, github: "brooklinjazz/hidden_cell"}
])

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Create The Perfect AI

You're going to create the perfect AI for rock paper scissors that will always win.

flowchart LR
scissors --beats--> paper --beats--> rock --beats--> scissors
Loading

Generate a random player choice of :rock ,:paper, or :scissors or manually enter :rock, :paper, and :scissors to determine your program works correctly.

player_choice = Enum.random([:rock, :paper, :scissors])

Then, return the winning choice of either :rock, :paper, or :scissors that beats the player's choice.

Example solution 
player_choice = :scissors

case player_choice do
  :rock -> :paper
  :paper -> :scissors
  :scissors -> :rock
end

Enter your solution below.



Create Two Player Rock Paper Scissors


Now that you know how to create a rock paper scissors AI, you're going to create a two player game of rock paper scissors.


Bind a player1_choice and player2_choice variable to :rock, :paper, or :scissors.


    

  • If player1_choice beats player2_choice, return "Player 1 wins!".
    • 

  • If player2_choice beats player1_choice, return "Player 2 wins!".
    • 

  • If both players have the same choice, then return "Draw".
    • 




  Example solution

player1 = :rock
player2 = :scissors

case {player1, player2} do
  {:rock, :scissors} -> "Player 1 Wins!"
  {:paper, :rock} -> "Player 1 Wins!"
  {:scissors, :paper} -> "Player 1 Wins!"
  {:rock, :paper} -> "Player 2 Wins!"
  {:paper, :scissors} -> "Player 2 Wins!"
  {:scissors, :rock} -> "Player 2 Wins!"
  {_same, _same} -> "Draw"
end


You can also reduce code repetition using functions and the in keyword to check if the value exists in a list.


player1 = :rock
player2 = :scissors

beats? = fn choice1, choice2 ->
  {choice1, choice2} in [{:rock, :scissors}, {:paper, :rock}, {:scissors, :paper}]
end

cond do
  beats?.(player1, player2) -> "Player1"
  beats?.(player2, player1) -> "Player2"
  player1 == player2 -> "Draw"
end




Enter your solution below.




Commit Your Progress


DockYard Academy now recommends you use the latest Release rather than forking or cloning our repository.


Run git status to ensure there are no undesirable changes.
Then run the following in your command line from the curriculum folder to commit your progress.


$ git add .
$ git commit -m "finish Rock Paper Scissors exercise"
$ git push



We're proud to offer our open-source curriculum free of charge for anyone to learn from at their own pace.


We also offer a paid course where you can learn from an instructor alongside a cohort of your peers.
We will accept applications for the June-August 2023 cohort soon.


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