t-t-t-action-replay-4.js

let handleTurnTaken = (turnTakenEvent) => {
    if(turnTakenEvent.gameboard[turnTakenEvent.row][turnTakenEvent.col] !== 'X' && turnTakenEvent.gameboard[turnTakenEvent.row][turnTakenEvent.col] !== 'O') {

        console.log('Player ' + turnTakenEvent.player + ' has taken a turn');
        let nextPlayer = turnTakenEvent.player === 'O' ? 'X' : 'O';
        let nextGameBoard = turnTakenEvent.gameboard.map(
            (row, rIndex) => {
                return row.map((col, cIndex) => {
                    return rIndex === turnTakenEvent.row && cIndex === turnTakenEvent.col ?
                        turnTakenEvent.player : col 
                });
            }
        ) 

        if (winChecker.thereIsAWinner(nextGameBoard)) {
            eventDispatcher.dispatch({
                name: 'winner-determined-event',
                winner: turnTakenEvent.player,
                gameboard: nextGameBoard
            });
        }
        else if (winChecker.gameBoardIsFull(nextGameBoard)){
            eventDispatcher.dispatch({
                name: 'completed-with-no-winner-event',
                gameboard: nextGameBoard
            });
        } else {
            eventDispatcher.dispatch({
                name: 'game-board-updated-event',
                nextPlayer: nextPlayer,
                gameboard: nextGameBoard 
            });
        }
    }
}