kotlin.collections.filterNotNullTo
filterNotNullTo
fun <C : MutableCollection<in T>, T : Any> Iterable<T?>.filterNotNullTo( destination: C ): C
fun <C : MutableCollection<in T>, T : Any> Array<out T?>.filterNotNullTo( destination: C ): C
Appends all elements that are not null
to the given destination.