fun <T : Any> Sequence<T?>.filterNotNull(): Sequence<T>
Returns a sequence containing all elements that are not null.
The operation is intermediate and stateless.
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
val numbers: List<Int?> = listOf(1, 2, null, 4)
val nonNullNumbers = numbers.filterNotNull()
println(nonNullNumbers) // [1, 2, 4]
//sampleEnd
}
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.sequences/filter-not-null.html