description

# operator [] method

V? operator [](

1. Object? key

)
override

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

    V? operator [](Object? key) => _untypedLookup(key)?.value;