sanpak/tic-tac-toe

app academy prep course tic-tac-toe

Tic-Tac-Toe

Let's write a Tic-Tac-Toe game! Read the entire instructions before getting started.

• In your Board class, you should have a grid instance variable to keep track of the board tiles. You should also have the following methods:

  • place_mark, which takes a position such as [0, 0] and a mark such as :X as arguments. It should throw an error if the position isn't empty.
  • empty?, which takes a position as an argument
  • winner, which should return a mark
  • over?, which should return true or false
  • If you want to be a little fancy, read the attached bracket-methods reading.

• In your player classes, have an instance variable mark that the game will set on initialize.

• In your HumanPlayer class,

  • display should print the board out to the console
  • get_move should allow the player to enter a move of the form '0, 0', and return it as a position of the form [0, 0]

• In your ComputerPlayer class,

  • display should store the board it's passed as an instance variable, so that get_move has access to it
  • get_move should return a winning move if one is available, and otherwise move randomly.

• In your Game class, set the marks of the players you are passed. Include the following methods:

  • current_player
  • switch_players!
  • play_turn, which handles the logic for a single turn
  • play, which calls play_turn each time through a loop until the game is over

Pro tips:

• Both HumanPlayer and ComputerPlayer should have the same API; they should have the same set of public methods. This means they should be interchangeable.
• Your Game class should be passed two player objects on instantiation; because both player classes have the same API, the game should not know nor care what kind of players it is given.

Run the specs in this order: rspec spec/board_spec.rb rspec spec/human_player_spec.rb rspec spec/computer_player_spec.rb rspec spec/game_spec.rb rspec spec

Note that the specs are written to help you build the game in a very specific way; there are other implementations that would also result in a playable game but not pass the specs. We choose to sacrifice flexibility of design in order to offer you more support implementing this particular solution. Don't worry, you'll have plenty of opportunities to make larger-scale design decisions going forward!