kotlin-stdlib/kotlin.collections/listOfNotNull

listOfNotNull

fun <T : Any> listOfNotNull(element: T?): List<T>

Returns a new read-only list either of single given element, if it is not null, or empty list if the element is null. The returned list is serializable (JVM).

Samples

import samples.*
import kotlin.test.*
fun main() { 
   //sampleStart 
   val empty = listOfNotNull<Any>(null)
assertPrints(empty, "[]")

val singleton = listOfNotNull(42)
assertPrints(singleton, "[42]")

val list = listOfNotNull(1, null, 2, null, 3)
assertPrints(list, "[1, 2, 3]") 
   //sampleEnd
}

fun <T : Any> listOfNotNull(vararg elements: T?): List<T>

Returns a new read-only list only of those given elements, that are not null. The returned list is serializable (JVM).

Samples

import samples.*
import kotlin.test.*
fun main() { 
   //sampleStart 
   val empty = listOfNotNull<Any>(null)
assertPrints(empty, "[]")

val singleton = listOfNotNull(42)
assertPrints(singleton, "[42]")

val list = listOfNotNull(1, null, 2, null, 3)
assertPrints(list, "[1, 2, 3]") 
   //sampleEnd
}