diff --git a/u2/list_ops.py b/u2/list_ops.py
index 1ecfbef..15bae72 100644
--- a/u2/list_ops.py
+++ b/u2/list_ops.py
@@ -7,7 +7,7 @@ def append(list1, list2):
     return result
 def concat(lists):
     result = []
-    for item in lists
+    for item in lists:
         result = append(result, item)
     return result
 def filter(function, list):
@@ -20,5 +20,10 @@ def length(list) :
     for item in list:
         counter = counter + 1
     return counter
-    
+def map(function, list)
+    res = []
+    for item in list:
+        res = [function(item)] + res
+    return res
+def 
         
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