たろー先生助けて！

test.kt

fun hoge(i : Int) = if(i % 3 == 0 ) null else i

val sum = (1 .. 10).map(::hoge).filterNotNull().reduce{ a, b -> a + b}

println(sum)
  

test.scala

def hoge(i :Int ) = if( i % 3 == 0) None else Some(i)

val sum = (1 to 10).map(hoge).flatten.reduce(_ + _)

(1..10).map(::hoge).filterNotNull().reduce{a, b -> a + b}