filter doesn't change the type, it only removes el...

# announcements

[jw]

filter doesn't change the type, it only removes elements

[joscha.alisch]

Removing all the null values would however effectively change the type from nullable String to string? So a smart cast seems sensible to me here?

[jw]

Smart cast works on it inside the lambda

[jw]

filter is a function and it's return type is defined as the same type of its receiver

[araqnid]

afaik not much you can do but to cast it 😞 but at least you can isolate that in a single place:

@Suppress("UNCHECKED_CAST")
fun <K, V> Map<K, V?>.filterNonNullValues() = filterValues { it != null } as Map<K, V>

[joscha.alisch]

That’s what I ended up doing @araqnid, thanks 🙂