Hi everyone. Could you recommend the best way to i...

# random

[IRomanov]

Hi everyone. Could you recommend the best way to implement function, that accepts map with nullable key type and returns the same one without null keys and non-nullable key type? I found to ways, but I don't like both of them...

fun mapWithoutNullKeys(myMap: Map<String?, String>): Map<String, String> = myMap
    .map { it.key to it.value }
    .filterIsInstance<Pair<String, String>>()
    .toMap()

because a lot of transformations and some overhead or

fun mapWithoutNullKeys(myMap: Map<String?, String>): Map<String, String> {
    return myMap.filterKeys { it != null } as Map<String, String>
}

because of unchecked cast.

Maybe there is some method from stdlib for that task?