updateAll method Null safety

void updateAll (
  1. V update(
    1. K key,
    2. V value

Updates all values.

Iterates over all entries in the map and updates them with the result of invoking update.


void updateAll(V update(K key, V value)) {
  for (var key in this.keys) {
    this[key] = update(key, this[key] as V);