orEmpty
fun
<
reified
T
>
Array
<
out
T
>
?
.
orEmpty
(
)
:
Array
<
out
T
>
(Common source) (JVM source) (Native source)
Returns the array if it's not
null
, or an empty array otherwise.
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
val nullArray: Array<Any>? = null
println(nullArray.orEmpty().contentToString()) // []
val array: Array<Char>? = arrayOf('a', 'b', 'c')
println(array.orEmpty().contentToString()) // [a, b, c]
//sampleEnd
}
Returns this Collection if it's not
null
and the empty list otherwise.
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
val nullCollection: Collection<Any>? = null
println(nullCollection.orEmpty()) // []
val collection: Collection<Char>? = listOf('a', 'b', 'c')
println(collection.orEmpty()) // [a, b, c]
//sampleEnd
}
Returns this List if it's not
null
and the empty list otherwise.
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
val nullList: List<Any>? = null
println(nullList.orEmpty()) // []
val list: List<Char>? = listOf('a', 'b', 'c')
println(list.orEmpty()) // [a, b, c]
//sampleEnd
}
Returns the
Map
if its not
null
, or the empty
Map
otherwise.
import kotlin.test.*
import java.util.*
fun main(args: Array<String>) {
//sampleStart
val nullMap: Map<String, Any>? = null
println(nullMap.orEmpty()) // {}
val map: Map<Char, Int>? = mapOf('a' to 1, 'b' to 2, 'c' to 3)
println(map.orEmpty()) // {a=1, b=2, c=3}
//sampleEnd
}