filterNotNull
Returns a sequence containing all elements that are not null.
fun <T : Any> Sequence<T?>.filterNotNull(): Sequence<T>(source)
val numbers: Sequence<Int?> = sequenceOf(1, null, 3, null, 5)
val nonNullNumbers: Sequence<Int> = numbers.filterNotNull()
println(nonNullNumbers.toList()) // Output: [1, 3, 5]