Find connected cells

// For a matrix of 0s and you have to find the number of 1s

              0001000
              0011100
              0110000
              1110000
              0100000


function getRegionSize(matrix, row, column) {
  if (row < 0 || column < 0 || row >= matrix.length || column >= matrix[row].length) {
    return 0;
  } if (matrix[row][column] === 0) {
    return 0;
  }
  matrix[row][column] = 0;
  let size = 1;
  for (let r = row - 1; r <= row + 1; r++) {
    for (let c = column - 1; c <= column + 1; c++) {
      if (r !== row || c !== column) {
        size += getRegionSize(matrix, r, c);
      }
    }
  }
  return size;
}

function getBiggestRegion(matrix) {
  let maxRegion = 0;
  
  for (let row = 0; row < matrix.length; row++) {
    for (let column = 0; column < matrix[row].length; column++) {
      if (matrix[row][column] === 1) {
        let size = getRegionSize(matrix, row, column);
        if (maxRegion < size) maxRegion = size;
      }
    }
  }
  return maxRegion;
}