TicTacToe win logic for NxN board

Question

Current logic works fine with 3x3 board because it is static. How can I convert it into NxN logic?

Win logic works by adding the row and column squares.

Answer 1

This matches your list for three, and I've checked two by hand. It certainly seems right, as the code is really dead simple, but you'll probably want to check it over:

var getWins = function(size) {
    var val = 1, cells = [], wins = [];
    for (var i = 0; i < size; i++) {
        cells[i] = [];
        for (var j = 0; j < size; j++) {
            cells[i][j] = val;
            val *= 2;
        }
    }
    var rowWins = [], colWins = [], mainDiagWin = 0, antiDiagWin = 0;
    for (i = 0; i < size; i++) {
        rowWins[i] = 0;
        colWins[i] = 0;
        mainDiagWin += cells[i][i];
        antiDiagWin += cells[i][size - i - 1];
        for (j = 0; j < size; j++) {
            rowWins[i] += cells[i][j];
            colWins[i] += cells[j][i];
        }
    }
    return rowWins.concat(colWins, mainDiagWin, antiDiagWin);
};

getWins(2);
//=> [3, 12, 5, 10, 9, 6]

getWins(3);
//=> [7, 56, 448, 73, 146, 292, 273, 84]

getWins(4)
//=> [15, 240, 3840, 61440, 4369, 8738, 17476, 34952, 33825, 4680]