lastOrNull
Returns the last element, or
null
if the array is empty.
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
val list = listOf(1, 2, 3, 4)
println(list.last()) // 4
println(list.last { it % 2 == 1 }) // 3
println(list.lastOrNull { it < 0 }) // null
// list.last { it < 0 } // will fail
val emptyList = emptyList<Int>()
println(emptyList.lastOrNull()) // null
// emptyList.last() // will fail
//sampleEnd
}
@ExperimentalUnsignedTypes
inline
fun
ULongArray
.
lastOrNull
(
predicate
:
(
ULong
)
->
Boolean
)
:
ULong
?
(source)
@ExperimentalUnsignedTypes
inline
fun
UByteArray
.
lastOrNull
(
predicate
:
(
UByte
)
->
Boolean
)
:
UByte
?
(source)
@ExperimentalUnsignedTypes
inline
fun
UShortArray
.
lastOrNull
(
predicate
:
(
UShort
)
->
Boolean
)
:
UShort
?
(source)
Returns the last element matching the given
predicate
, or
null
if no such element was found.
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
val list = listOf(1, 2, 3, 4)
println(list.last()) // 4
println(list.last { it % 2 == 1 }) // 3
println(list.lastOrNull { it < 0 }) // null
// list.last { it < 0 } // will fail
val emptyList = emptyList<Int>()
println(emptyList.lastOrNull()) // null
// emptyList.last() // will fail
//sampleEnd
}
Returns the last element, or
null
if the collection is empty.
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
val list = listOf(1, 2, 3, 4)
println(list.last()) // 4
println(list.last { it % 2 == 1 }) // 3
println(list.lastOrNull { it < 0 }) // null
// list.last { it < 0 } // will fail
val emptyList = emptyList<Int>()
println(emptyList.lastOrNull()) // null
// emptyList.last() // will fail
//sampleEnd
}
Returns the last element, or
null
if the list is empty.
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
val list = listOf(1, 2, 3, 4)
println(list.last()) // 4
println(list.last { it % 2 == 1 }) // 3
println(list.lastOrNull { it < 0 }) // null
// list.last { it < 0 } // will fail
val emptyList = emptyList<Int>()
println(emptyList.lastOrNull()) // null
// emptyList.last() // will fail
//sampleEnd
}