operator [] method

  1. @override
V? operator [](
  1. 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.


V? operator [](Object? key) {
  if (!_isValidKey(key)) return null;
  var pair = _base[_canonicalize(key as K)];
  return pair?.value;