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 left
• top middle
• top right
• middle left
• center
• middle right
• bottom left
• bottom middle
• bottom 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.