--- a/progs/lecture2.scala	Tue Nov 19 06:38:20 2019 +0000
+++ b/progs/lecture2.scala	Fri Nov 22 16:41:45 2019 +0000
@@ -159,6 +159,12 @@
   Some(x / y)
 }).getOrElse(None)
 
+
+// minOption 
+// maxOption 
+// minByOption 
+// maxByOption
+
 // Higher-Order Functions
 //========================