Find max connected component.js

// * Find max connected component in an image
// https://www.geeksforgeeks.org/find-number-of-islands/
// https://www.geeksforgeeks.org/find-the-number-of-islands-set-2-using-disjoint-set/
// https://leetcode.com/problems/number-of-islands/description/
// https://leetcode.com/problems/number-of-islands/discuss/131474/Clean-javascript-solution-using-DFS
// https://leetcode.com/problems/number-of-islands/discuss/131165/Detailed-Explanation-of-the-Java-solution
var input = [
  [1, 1, 1, 1, 0],
  [1, 1, 0, 1, 0],
  [1, 1, 0, 0, 0],
  [0, 0, 0, 0, 0]
];
var input2 = [
  [1, 1, 0, 0, 0],
  [1, 1, 0, 0, 0],
  [0, 0, 1, 0, 0],
  [0, 0, 0, 1, 1]
];
// Number of islands is: 5
let rowCount = input.length;
let colCount = input[0].length;
function findIslands(input, rowCount, colCount) {
  let total = 0;
  for (let i = 0; i < rowCount; i++) {
    for (let j = 0; j < colCount; j++) {
      if (input[i][j] === 1) {
        search(input, i, j);
        total++;
      }
    }
  }
  return total;
}

function search(input, row, col) {
  if (
    row < 0 ||
    col < 0 ||
    row > rowCount - 1 ||
    col > colCount - 1 ||
    input[row][col] === 0
  ) {
    return;
  }
  input[row][col] = 0;
  search(input, row - 1, col);
  search(input, row, col + 1);
  search(input, row + 1, col);
  search(input, row, col - 1);
}

console.log(findIslands(input, rowCount, colCount));
console.log(findIslands(input2, rowCount, colCount));