Question

Ello Chaps and Chapesses!

I have a Javascript array like this:

var tinkerArray = [
  [0,0,0],
  [0,1,0],
  [0,0,0]
];

My question is, how can I check the array nodes surrounding each node…

e.g. starting at [0,0], check [0,1] and [1,0] etc etc

Thanks!

edit: if possible I would like a scalable solution whereby if the array was 7×7 – the algorithm would still work… :/

Answer 1

Update:

function getSurrounding(arr, i, j) {
  var m, n, result = [];
  for (m = i - 1; m <= i + 1; m++) {
    if (m in arr) {
      for (n = j - 1; n <= j + 1; n++) {
         if (n in arr[m] && !(m == i && n == j)) {
            result.push(arr[m][n]);
         }
      }
    }
  }
  return result;
}