Function swap2

javascript/0048-rotate-image.js:44–48

(matrix, row, col, reflection)

};

var swap2 = (matrix, row, col, reflection) =>
    ([matrix[row][col], matrix[row][reflection]] = [
        matrix[row][reflection],
        matrix[row][col],
    ]);

/**
 * Time O(ROWS * COLS) | Space O(1)