Scala v/s Kotlin

test.kts

var count = 0
var totalTime = 0L

fun test() {
  val start = System.currentTimeMillis()

  val x = (1L..5000000L) map {it * 40} reduce {a,b -> (a*b)%19 + 1}

  val end = System.currentTimeMillis()

  val timeTaken = (end - start)
  totalTime += timeTaken

  println("answer is: " + x)
  println("     time: " + timeTaken + " ms")

  count += 1
}

test()
test()
test()
test()
test()

test()
test()
test()
test()
test()
  
println("Avg time: " + (totalTime.toDouble() / count))

test.scala

var count = 0
var totalTime = 0L

def test() {
  val start = System.currentTimeMillis()
  val x = (1L to 5000000L) map {_ * 40} reduce {(a,b) => (a*b)%19 + 1}
  val end = System.currentTimeMillis()

  val timeTaken = (end - start)
  totalTime += timeTaken

  println("answer is: " + x)
  println("     time: " + timeTaken + " ms")

  count += 1
}

test()
test()
test()
test()
test()

test()
test()
test()
test()
test()

println("Avg time: " + (totalTime.toDouble / count))

In Scala you should do (1 to 1000000).view that turns it lazy.