filterNotNullTo
Appends all elements that are not null to the given destination.
@IgnorableReturnValuefun <C : MutableCollection<in T>, T : Any> Sequence<T?>.filterNotNullTo(destination: C): C(source)
val nullableNumbers: Sequence<Int?> = sequenceOf(1, null, 2, null, 3)
val nonNullList = mutableListOf<Int>()
nullableNumbers.filterNotNullTo(nonNullList)
// nonNullList now contains [1, 2, 3]