fun getFirstLast(ar: Array<Int>): Pair<Int, Int> {
var first = -1
var last = -1
if (ar.isNotEmpty()) {
first = ar[0]
last = ar[ar.size-1]
}
return Pair(first, last)
}
val ar = arrayOf(2, 3, 5)
val (first, last) = getFirstLast(ar)
//first is 2
//last is 5
println("first is $first")
println("last is $last")