Clone the repository and change into the project's directory.
Video of me running through the usage process
Run ruby tic_tac_toe.rb.
You'll be prompted to choose a character. Your choice must be an X or an O.
From here, you will be prompted to make a move. Here are your options:
top lefttop middletop rightmiddle leftcentermiddle rightbottom leftbottom middlebottom right
After you make a move, the computer will respond with one of its own, a visual representation of the board will be displayed, and the process repeats until there is a winner.
When asked for another game, reply Yes to do so. Typing anything else will exit the game.
The Board is represented as an Array with 9 openings (8 indexes). Each of these openings contains a Cell. There is an attribute on Cell instances called value that stores either an X or an O.
The board, with its WINNING_COMBINATIONS constant, is also aware of which indexes need to be filled in order for there to be a potential winner.
The sauce is in #winner?, where we iterate over each combination in WINNING_COMBINATIONS, and check to see if each of those indexes contain the same value.
There is also a check to see if one of those indexes is a String so that the board doesn't interpret three consecutive :blank cells as there being a winner.