scala> val ll = List(1,2,3,5,5)
ll: List[Int] = List(1, 2, 3, 5, 5)
scala> ll.take(2)
res3: List[Int] = List(1, 2)
scala> def compare(a:Int, b:Int):Boolean = {
| println("comparing %s and %s".format(a,b))
| a>b
| }
compare: (a: Int, b: Int)Boolean
scala> compare(33,11)
comparing 33 and 11
res4: Boolean = true
scala> ll.sortWith(compare)
comparing 2 and 1
comparing 3 and 2
comparing 5 and 3
comparing 5 and 5
comparing 5 and 5
comparing 5 and 2
comparing 5 and 3
comparing 5 and 5
comparing 5 and 5
res5: List[Int] = List(5, 5, 3, 2, 1)
scala> List(10, 5, 8, 1, 7).sortWith(_ < _)
res1: List[Int] = List(1, 5, 7, 8, 10)
