kotlin-stdlib/kotlin.collections/listOfNotNull

listOfNotNull

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).

Samples



import kotlin.test.*
fun main() { 
   //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
}

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).

Samples



import kotlin.test.*
fun main() { 
   //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
}