--- a/progs/lecture1.scala	Thu Nov 10 04:02:45 2016 +0000
+++ b/progs/lecture1.scala	Thu Nov 10 10:40:05 2016 +0000
@@ -20,8 +20,9 @@
 (1 until 10).toList
 
 // an element in a list
-List(1, 2, 3, 1)(0)
-List(1, 2, 3, 1)(3)
+val lst = List(1, 2, 3, 1)
+lst(0)
+lst(2)
 
 1::2::3::Nil
 List(1, 2, 3) ::: List(4, 5, 6)
@@ -31,8 +32,7 @@
 
 println("test")
 
-
-val tst = "This is a " ++ "test\n" 
+val tst = "This is a " + "test\n" 
 println(tst)
 
 val lst = List(1,2,3,1)
@@ -40,6 +40,8 @@
 println(lst.toString)
 println(lst.mkString("\n"))
 
+println(lst.mkString(", "))
+
 // some methods take more than one argument
 println(lst.mkString("[", ",", "]"))