putIfAbsent method

*<Null safety>*

• @override

V putIfAbsent (K key, V ifAbsent()) override

Implementation

@override
V putIfAbsent(K key, V Function() ifAbsent) {
  return _base
      .putIfAbsent(_canonicalize(key), () => MapEntry(key, ifAbsent()))
      .value;
}