--- a/progs/lecture2.scala	Mon Mar 12 12:11:50 2018 +0000
+++ b/progs/lecture2.scala	Tue May 15 01:14:07 2018 +0100
@@ -452,6 +452,12 @@
 // function in which return appears."
 
 def sq1(x: Int): Int = x * x
+def sumq(ls: List[Int]): Int = 
+  ls.map(x => x * x).sum
+
+
+
+
 def sq2(x: Int): Int = return x * x
 
 def sumq(ls: List[Int]): Int = {
@@ -467,6 +473,7 @@
   sqs.sum
 }
 
+sumq(List(1, 2, 3, 4))