kotlin-stdlib / kotlin.collections / listOfNotNull

listOfNotNull

Common
JVM
JS
Native
1.0
fun <T : Any> listOfNotNull(element: T?): List<T>
(source)

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).

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val empty = listOfNotNull<Any>(null)
println(empty) // []

val singleton = listOfNotNull(42)
println(singleton) // [42]

val list = listOfNotNull(1, null, 2, null, 3)
println(list) // [1, 2, 3]
//sampleEnd
}
Common
JVM
JS
Native
1.0
fun <T : Any> listOfNotNull(vararg elements: T?): List<T>
(source)

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

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val empty = listOfNotNull<Any>(null)
println(empty) // []

val singleton = listOfNotNull(42)
println(singleton) // [42]

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