toBuiltMapList method
BuiltMap<K, BuiltList<V> >
toBuiltMapList()
Grouping the results in list according to key.
Implementation
BuiltMap<K, BuiltList<V>> toBuiltMapList() {
final map = <K, ListBuilder<V>>{};
for (var entry in this) {
map.putIfAbsent(entry.key, () => ListBuilder<V>()).add(entry.value);
}
return map.map((key, value) => MapEntry(key, value.build())).build();
}