update method

IMapOfSets<K, V> update(K key, ISet<V> update(ISet<V> set), { ISet<V> ifAbsent()?, Output<ISet<V>>? previousSet, })

Updates the set for the provided key.

If the key is present, invokes update with the current set and stores the new set in the map.

If the key is not present and ifAbsent is provided, calls ifAbsent and adds the key with the returned set to the map.

If the key is not present and ifAbsent is not provided, return the original map without modification. Note: If you want ifAbsent to throw an error, pass it like this: ifAbsent: () => throw ArgumentError();.

If you want to get the original set before the update, you can provide the previousSet parameter.

Implementation

IMapOfSets<K, V> update(
  K key,
  ISet<V> Function(ISet<V> set) update, {
  ISet<V> Function()? ifAbsent,
  Output<ISet<V>>? previousSet,
}) {
  bool Function(K key, ISet<V> set)? ifRemove;
  if (config.removeEmptySets) ifRemove = (K key, ISet<V> set) => set.isEmpty;

  return IMapOfSets<K, V>._unsafe(
      _mapOfSets.update(
        key,
        update,
        ifAbsent: ifAbsent,
        ifRemove: ifRemove,
        previousValue: previousSet,
      ),
      config);
}