filter
Returns a list containing all elements that are not null.
Samples
import samples.*
import kotlin.test.*
fun main() {
//sampleStart
val numbers: List<Int?> = listOf(1, 2, null, 4)
val nonNullNumbers = numbers.filterNotNull()
assertPrints(nonNullNumbers, "[1, 2, 4]")
//sampleEnd
}