diff --git a/stages/2/Main.elm b/stages/2/Main.elm
index 7d5780b..f10de6a 100644
--- a/stages/2/Main.elm
+++ b/stages/2/Main.elm
@@ -91,26 +91,19 @@ viewSearchResult address result =
         ]
         [ text result.name ]
     , button
-        -- TODO add an onClick handler that sends a HideById action
+        -- TODO add an onClick handler that sends a HIDE_BY_ID action
         [ class "hide-result" ]
         [ text "X" ]
     ]
 
 
 type alias Action =
-  { actionType : String
-  , payload : Int
+  { -- TODO implement this type alias
   }
 
 
 update : Action -> Model -> Model
 update action model =
-  if action.actionType == "HIDE_BY_ID" then
-    let
-      -- TODO build a new model without the given ID present anymore.
-      newModel =
-        model
-    in
-      newModel
-  else
-    model
+  -- TODO if we receive a HIDE_BY_ID action,
+  -- build a new model without the given ID present anymore.
+  model
diff --git a/stages/4/Main.elm b/stages/4/Main.elm
index cf1ac7a..99c8f96 100644
--- a/stages/4/Main.elm
+++ b/stages/4/Main.elm
@@ -155,8 +155,7 @@ update action model =
     HideById idToHide ->
       let
         newResults =
-          model.results
-            |> List.filter (\{ id } -> id /= idToHide)
+          List.filter (\{ id } -> id /= idToHide) model.results
 
         newModel =
           { model | results = newResults }