inline fun CharSequence.elementAtOrElse( index: Int, defaultValue: (Int) -> Char ): Char
Returns a character at the given index or the result of calling the defaultValue function if the index is out of bounds of this char sequence.
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
val list = listOf(1, 2, 3)
println(list.elementAtOrElse(0) { 42 }) // 1
println(list.elementAtOrElse(2) { 42 }) // 3
println(list.elementAtOrElse(3) { 42 }) // 42
val emptyList = emptyList<Int>()
println(emptyList.elementAtOrElse(0) { "no int" }) // no int
//sampleEnd
}
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/element-at-or-else.html