firstWhereIndexedOrNull method Null safety

T? firstWhereIndexedOrNull(
  1. bool test(
    1. int index,
    2. T element

The first element whose value and index satisfies test.

Returns null if there are no element and index satisfying test.


T? firstWhereIndexedOrNull(bool Function(int index, T element) test) {
  var index = 0;
  for (var element in this) {
    if (test(index++, element)) return element;
  return null;