Kotlin and Scala

gistfile1.txt

== Kotlin

class T {
    fun t(): Unit  {
        val double = { x:Int -> x * 2 }
        listOf(1,2).map { x -> x * 2  }.map{ it + 1 }.map( double )
    }
}

creates

T$t$double$1.class
T.class

== Scala 

class T {
  def t(): Unit = {
    val double = (x: Int) => x + 1
    List(1, 2).map { x => x * 2 }.map { _ + 1}.map(double)
  }
}

creates

T$$anonfun$1.class
T$$anonfun$t$1.class
T$$anonfun$t$2.class
T.class

Since 2.11.8 you can enable an experimental mode to use Java8 lambda functions ...