elementAt 
  Returns an element at the given index or throws an IndexOutOfBoundsException if the index is out of bounds of this sequence.
The operation is terminal.
Since Kotlin
1.0Samples
import kotlin.math.*
import kotlin.test.*
fun main() { 
   //sampleStart 
   val list = listOf(1, 2, 3)
println(list.elementAt(0)) // 1
println(list.elementAt(2)) // 3
// list.elementAt(3) // will fail with IndexOutOfBoundsException
val emptyList = emptyList<Int>()
// emptyList.elementAt(0) // will fail with IndexOutOfBoundsException 
   //sampleEnd
}