lastOrNull
Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0)
fun <T> Sequence<T>.lastOrNull(): T?
Returns the last element, or null if the sequence is empty.
The operation is terminal.
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
}
Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0)
inline fun <T> Sequence<T>.lastOrNull( predicate: (T) -> Boolean ): T?
Returns the last element matching the given predicate, or null if no such element was found.
The operation is terminal.
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
} © 2010–2022 JetBrains s.r.o. and Kotlin Programming Language contributors
Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.sequences/last-or-null.html
