lastIndex
Returns the last valid index for the array.
Since Kotlin
1.0Returns the last valid index for the array.
Since Kotlin
1.3Returns 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
}