operator [] method

@override V? operator [](Object? key)

The value for the given key, or null if key is not in the map.

Some maps allow null as a value. For those maps, a lookup using this operator cannot distinguish between a key not being in the map, and the key being there with a null value. Methods like containsKey or putIfAbsent can be used if the distinction is important.

Implementation

@override
V? operator [](Object? key) {
  assert(key != null);
  final ret = _dbm.get(_keySerializer(key as K));
  return ret != null ? _valueDeserializer(ret) : null;
}