robertjlooby / tic-tac-toe

This program implements an unbeatable Tic-Tac-Toe AI in Ruby

requires Ruby 1.9

To play the game run rake play

To run the included unit tests run rake test

The implementation of the AI is explained in the comments for AIPlayer#get_move

Changes in V3

• Split source and test files into separate directories
• Rakefile now uses Rake::TestTask to run tests, much cleaner output
• All terminal IO is abstracted into Reader/Writer classes, allows much better test coverage and cleaner output (http://blog.8thlight.com/josh-cheek/2011/10/01/testing-code-thats-hard-to-test.html)

Changes in V2

Rakefile

• Now use rake play to play game, rake test to run tests
• Test coverage extended, includes testing methods that take user input (which puts a lot of garbage to the terminal but you can still see all the tests passing)

User Interface

• User now enters a cell number (0-8) instead of row/column
• Improved ANSI art with UTF-8 box symbols
• Slightly changed the user prompts

AIPlayer

• Now is its own class, does not inherit from player
• Move was only used by the AIPlayer so that class is now internal to the AIPlayer

Player

• Now prompts player for cell number 0-8
• No parts that are only necessary for the AIPlayer

Board

• Current player now represented by a symbol :X or :O
• Board state representaion now 3x3 array of nil, :X, :O Much easier to understand
• Moves now made by row/column, only AIPlayer knows about Moves
• Simplified win/tie checking into one method Now returns :X, :O, :tie, :none; clearer meaning
• Made board larger, better looking, easier to read
• separated display of board from board class

Tic-Tac-Toe

• Separated different phases of game into their own methods
• Game now played by creating an instance of the TicTacToe class
• Made game logic easier to follow

Overall

• Removed extraneous exceptions and state checking that never occur when playing the game
• Code easier to read and understand