level property Null safety

Implementation

int get level {
  switch (this) {
    case CowStatusType.good:
      return 0;
    case CowStatusType.caution:
      return 1;
    case CowStatusType.alert:
      return 2;
    case CowStatusType.serious:
      return 3;
    default:
      return 0;
  }
}