firstWhereIndexedOrNull method

*<Null safety>*

T? firstWhereIndexedOrNull (bool test(int index, T element))

Implementation

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;
}