forEach method Null safety

void forEach(
  1. void f(
    1. K key,
    2. V value

Applies action to each key/value pair of the map.

Calling action must not add or remove keys from the map.


void forEach(void f(K key, V value)) {
  Iterator<MapEntry<K, V>> nodes = _SplayTreeMapEntryIterator<K, V>(this);
  while (nodes.moveNext()) {
    MapEntry<K, V> node = nodes.current;
    f(node.key, node.value);