Difference Between Ones and Zeros in Row and Column

export function onesMinusZeros(grid: number[][]): number[][] {
  const [m, n] = [grid.length, grid[0].length];
  const onesRow = new Array(m).fill(0);
  const onesCol = new Array(n).fill(0);
  grid.forEach((row, i) => {
    row.forEach((value, j) => {
      if (value === 1) {
        onesRow[i] += 1;
        onesCol[j] += 1;
      }
    });
  });
 
  const getDiff = (i: number, j: number) => {
    return 2 * (onesRow[i] + onesCol[j]) - (m + n);
  };
 
  return grid.map((row, i) => row.map((_, j) => getDiff(i, j)));
}