lastIndex

Common
JVM
JS
Native
1.0
val < T > Array < out T > . lastIndex : Int
(source)
val ByteArray . lastIndex : Int
(source)
val ShortArray . lastIndex : Int
(source)
val IntArray . lastIndex : Int
(source)
val LongArray . lastIndex : Int
(source)
val FloatArray . lastIndex : Int
(source)
val DoubleArray . lastIndex : Int
(source)
val BooleanArray . lastIndex : Int
(source)
val CharArray . lastIndex : Int
(source)
@ExperimentalUnsignedTypes inline val UIntArray . lastIndex : Int
(source)
@ExperimentalUnsignedTypes inline val ULongArray . lastIndex : Int
(source)
@ExperimentalUnsignedTypes inline val UByteArray . lastIndex : Int
(source)
@ExperimentalUnsignedTypes inline val UShortArray . lastIndex : Int
(source)

Returns the last valid index for the array.

Common
JVM
JS
Native
1.0
val < T > List < T > . lastIndex : Int
(source)

Returns the index of the last item in the list or -1 if the list is empty.

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
println(emptyList<Any>().lastIndex) // -1
val list = listOf("a", "x", "y")
println(list.lastIndex) // 2
println(list[list.lastIndex]) // y
//sampleEnd
}