lastIndex
Returns the last valid index for the array.
Since Kotlin
1.0Returns the index of the last item in the list or -1 if the list is empty.
Since Kotlin
1.0Samples
import kotlin.test.*
fun main() {
//sampleStart
println(emptyList<Any>().lastIndex) // -1
val list = listOf("a", "x", "y")
println(list.lastIndex) // 2
println(list[list.lastIndex]) // y
//sampleEnd
}