kotlin-stdlib/kotlin.text/lastOrNull

lastOrNull

fun CharSequence.lastOrNull(): Char?(source)

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

Since Kotlin

1.0

Samples

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

fun main() { 
   //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
}
inline fun CharSequence.lastOrNull(predicate: (Char) -> Boolean): Char?(source)

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

Since Kotlin

1.0

Samples

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

fun main() { 
   //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
}