findContactsWithLastName method
Implementation
Set<int> findContactsWithLastName(String queryString) {
final herdersMatch =
all.where((c) => c.lastName.clean.contains(queryString.clean)).toList();
final herdersMatchIds = Set.of(<int>{});
for (final herder in herdersMatch) {
herdersMatchIds.add(herder.id);
}
return herdersMatchIds;
}