diff --git a/maps/myenum.exs b/maps/myenum.exs
index 97f6405..2cbd775 100644
--- a/maps/myenum.exs
+++ b/maps/myenum.exs
@@ -30,7 +30,21 @@ defmodule MyEnum do
     :ok
   end
 
+  # Filters the enumerable, i.e. returns only those elements for which fun returns a truthy value.
+  def filter([], _fun) do
+    # do nothing -> This is wrong. Return an empty array instead.
+	[]
+  end
+
    # filter using if ... do ... else ... end
+  def filter([head|tail], fun) do
+    if fun.(head) do
+      [head|filter(tail, fun)]
+    else
+      filter(tail, fun)
+    end
+  end
+
   # split
   # take
 end