Function flip

javascript/0861-score-after-flipping-matrix.js:23–41

(i, isRow)

    };

    const flip = (i, isRow) => {
        let start = 0;

        if (isRow) {
            while (start < ROW) {
                grid[i][start] ^= 1;
                start++;
            }
            return;
        }

        if (!isRow) {
            while (start < COL) {
                grid[start][i] ^= 1;
                start++;
            }
            return;
        }
    };

    for (let i = 0; i < COL; i++) {
        if (!grid[i][0]) flip(i, true);