operator [] method Null safety
- dynamic key
override
Returns the value for the given key
or null if key
is not in the map.
Some maps allow keys to have 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 having a null
value.
Methods like containsKey or putIfAbsent can be used if the distinction
is important.
Implementation
Map? operator [](dynamic key) => _getItem(key);