Scala or Kotlin

JVM has many language based on it, many of them are famous like Groovy, Scala, Koltin and others.

In the past I've played with Scala, now I try to post the same code snippet in Scala and in Koltin (actually koltin looks like scala in many ways):

Scala Code:

// scala

object Main {
  def main(args: Array[String]): Unit = {

    val a = 10
    val b = 50
    println(apply(a, b, { (x, y) => x * y }))
    println(apply(a, b, sum))

    val l = List(1, 3, 5)
    l map { _ * 2 } filter { _ > 4 } foreach { println(_) }
  }

  def sum(a: Int, b: Int): Int = a + b

  def apply(x: Int, y: Int, f: (Int, Int) => Int) = f(x, y)
}

Koltin Code:

// kotlin

fun main(args: Array<String>): Unit {

    val a = 10
    val b = 50
    println(apply(a, b, {x, y -> x * y}))
    println(apply(a, b, ::sum))

    val l = listOf(1, 3, 5)
    l.map { it * 2 } .filter { it > 4 } .forEach { println( it ) }
}


fun sum(a: Int, b: Int): Int = a + b

fun apply(x: Int, y: Int, f: (Int, Int)-> Int) = f(x, y)