mapToggleValue<K, V> static method

void mapToggleValue<K, V>({ required Map<K, List<V>> map, required K key, required V value, bool? add, })

Toggles value in the list at key within map.

If add is null, toggles based on current presence. If add is true, adds the value. If false, removes it. Audited: 2026-06-12 11:26 EDT

Implementation

static void mapToggleValue<K, V>({
  required Map<K, List<V>> map,
  required K key,
  required V value,
  bool? add,
}) {
  if (value == null) return;
  final bool shouldAdd = add ?? !mapContainsValue(map: map, key: key, value: value);
  if (shouldAdd) {
    mapAddValue(map: map, key: key, value: value);
  } else {
    mapRemoveValue(map: map, key: key, value: value);
  }
}