1 

     2 package Main

     3 

     4 object ComprehensionsTest extends App {

     5   def even(from: Int, to: Int): List[Int] =

     6     for (i <- List.range(from, to) if i % 2 == 0) yield i

     7 

     8   Console.println(even(0, 20))

     9 }

    10 

    11 object ComprehensionsTest2 extends App {

    12   def foo(n: Int, v: Int) =

    13     for (

    14       i <- 0 until n;

    15       j <- i + 1 until n if i + j == v

    16     ) yield Pair(i, j);

    17 

    18   foo(20, 32) foreach {

    19     case (i, j) =>

    20       println("(" + i + "," + j + ")")

    21   }

    22 }

    23 

    24 object ComprehensionTest3 extends App {

    25   for (

    26     i <- Iterator.range(0, 20);

    27     j <- Iterator.range(i + 1, 20) if i + j == 32

    28   ) println("(" + i + ", " + j + ")")

    29 }