diff --git a/27.nix b/27.nix
new file mode 100644
index 0000000..9499b8e
--- /dev/null
+++ b/27.nix
@@ -0,0 +1,10 @@
+let
+  bar = ["bar" "foo" "bla"];
+  numbers = [1 2 3 4];
+in
+{
+  #multiplies every number by 2
+  example = map (n: n * 2) numbers; 
+  #complete this
+  foobar = map ( bar: bar + "bar" ) bar;
+}