Freezed Collection #

Extending dart Freezed collection with deep copyWith.

Install #

dependencies:
  freezed_collection: ^2.1.3-pre1

Status #

• ✅ FreezedList<T>
• ✅ FreezedMap<T>
• ✅ FreezedSet<T>

copyWith #

Given:

@freezed
abstract class One with _$One {
  const factory One(String name, Two two) = _One;
}

@freezed
abstract class Two with _$Two {
  const factory Two(int index, FreezedMap<String, int> three) = _Two;
}

final one = One('a', Two(1, FreezedMap({'1': 2, '3': 4})));

then you can use copyWith chain:

final two = one.copyWith.two.three.withBase(() =>
    SplayTreeMap()).remove('1').addAll({'5': 6, '7': 8}).seal();

Sealing #

copyWith returns mutable builder with methods mapped to corresponding collection interface.

seal() method should be used to build freezed collection.

Chaining #

final map = FreezedMap({'1': 1});
final map2 = map.copyWith(map: {'2': 2, '3': 3}).updateAllValues((k, p0) => p0 + 1).removeWhere((k, v) => 2 == v).seal();

Json #

If FreezedMap<K,V> has non-standard (non-string) key, it will be encoded using json.encode and decoded using json.decode. This leads to some performance leakage. So use String for keys if you plan to serialize.