Object key
) Returns the value for the given key
or null if key
is not in the map.
Some maps allows keys to have null
as a value,
For those maps, a lookup using this operator does cannot be used to
distinguish between a key not being in the map, and the key having a null
value.
Methods like containsKey or putIfAbsent can be use if the distinction
is important.
Source
/**
* Returns the value for the given [key] or null if [key] is not in the map.
*
* Some maps allows keys to have `null` as a value,
* For those maps, a lookup using this operator does cannot be used to
* distinguish between a key not being in the map, and the key having a null
* value.
* Methods like [containsKey] or [putIfAbsent] can be use if the distinction
* is important.
*/
V operator [](Object key);