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# announcements
u
Uziel Sulkies
09/18/2019, 7:14 PMIs there a simple functional way to receive a non-nullable values map?
s
Shawn
09/18/2019, 7:16 PMI don’t think
filterNotcompiler can’t smartcast to non-null
also, you may want to project
VV : Anys
streetsofboston
09/18/2019, 7:16 PMNo short way, bu maybe like this:
this.filterNot { it.value == null }.map { it as Entry<K,V> }Entry^^^ I’m not even sure that will work….(don’t have IDE in front of me now :-)
This will work, but it will be an unsafe cast 🙂 :
this.filterNot { it.value == null } as Map<K,V>k
Kroppeb
09/18/2019, 7:20 PMJust put it into an extension function and call it a day
u
Uziel Sulkies
09/18/2019, 7:23 PMIt is an extension function we're trying to write. It is possible to do it this way. But is there a shorter way?
s
streetsofboston
09/18/2019, 7:25 PMI think just an unsafe cast would suffice…
Copy code
fun <K, V : Any> Map<K,V?>.filterNotNull(): Map<K,V> =
filter { it.value != null } as Map<K,V>s
Shawn A
09/18/2019, 7:40 PMs
Shawn
09/18/2019, 7:43 PMI mean, no, not just
mapNotNullyou’d need something a little more involved
Copy code
fun <K : Any, V : Any> Map<K, V?>.filterNullValues(): Map<K, V> {
return mapNotNull { it.value?.let { value -> it.key to value } }.toMap()
}since
mapNotNullList<R>and not a
Map<K, V>s
Shawn A
09/18/2019, 7:47 PMSorry, yes that is what I was getting it. Should have provided an example thanks 🙂
s
Shawn
09/18/2019, 7:48 PMmy point really being that going the
mapNotNull2 Views