description

# operator [] method Null safety

V? operator [] (

1. Object? key

)

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

    V? operator [](Object? key);