lastOrNull

kotlin-stdlib / kotlin.text / lastOrNull

Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0)

fun CharSequence.lastOrNull(): Char?

Returns the last character, or null if the char sequence is empty.

import java.util.Locale
import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val string = "Kotlin 1.4.0"
println(string.last()) // 0
println(string.last { it.isLetter() }) // n
println(string.lastOrNull { it > 'z' }) // null
// string.last { it > 'z' } //  will fail

val emptyString = ""
println(emptyString.lastOrNull()) // null
// emptyString.last() //  will fail
//sampleEnd
}

Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0)

inline fun CharSequence.lastOrNull(
    predicate: (Char) -> Boolean
): Char?

Returns the last character matching the given predicate, or null if no such character was found.

import java.util.Locale
import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val string = "Kotlin 1.4.0"
println(string.last()) // 0
println(string.last { it.isLetter() }) // n
println(string.lastOrNull { it > 'z' }) // null
// string.last { it > 'z' } //  will fail

val emptyString = ""
println(emptyString.lastOrNull()) // null
// emptyString.last() //  will fail
//sampleEnd
}

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/last-or-null.html