main.dart

class MyClass {
  int? anInt;
}

class MyOtherClass extends MyClass {
  int count = 0;
  
  int? get anInt {
    count++;
    return count % 2 == 1 ? 1 : null;
  }
}

void main() {
  final a = MyOtherClass();
  
  if (a.anInt != null) {
    print(a.anInt);
  }
}