description

# operator [] method Null safety

String? operator [] (

1. Object? 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

    String? operator [](Object? key) => _getItem(key as String);