diff --git a/u2/list_ops.py b/u2/list_ops.py
index f3ea299..54df691 100644
--- a/u2/list_ops.py
+++ b/u2/list_ops.py
@@ -28,8 +28,7 @@ def length(list):
 def map(function, list):
     result = []
     for x in list:
-        if function(x) not in result:
-            result = result + [x]
+        result = result + [function(x)]
     return result
 
 def foldl(function, list, initial):