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Exact lookup

1. lookup :: Eq a => a -> [(a, b)] -> Maybe b

   hledger-web	Hledger.Web.Import

   lookup key assocs looks up a key in an association list. For the result to be Nothing, the list must be finite.

   Examples

   >>> lookup 2 []
   Nothing
   

   >>> lookup 2 [(1, "first")]
   Nothing
   

   >>> lookup 2 [(1, "first"), (2, "second"), (3, "third")]
   Just "second"
   

2. lookup :: FromParam a => Param -> QueryData -> Maybe a

   hyperbole	Web.Hyperbole.Data.QueryData

   No documentation available.

3. lookup :: Param -> Cookies -> Maybe ParamValue

   hyperbole	Web.Hyperbole.Data.Session

   No documentation available.

4. lookup :: Ord x => T x y -> x -> (Maybe (x, y), Maybe (x, y))

   interpolation	Numeric.Interpolation.NodeList

   >>> Nodes.lookup (Nodes.fromList ([(0,'a'),(2::Int,'b')])) (-1)
   (Nothing,Just (0,'a'))
   
   >>> Nodes.lookup (Nodes.fromList ([(0,'a'),(2::Int,'b')])) 0
   (Just (0,'a'),Just (2,'b'))
   
   >>> Nodes.lookup (Nodes.fromList ([(0,'a'),(2::Int,'b')])) 1
   (Just (0,'a'),Just (2,'b'))
   
   >>> Nodes.lookup (Nodes.fromList ([(0,'a'),(2::Int,'b')])) 2
   (Just (2,'b'),Nothing)
   
   >>> Nodes.lookup (Nodes.fromList ([(0,'a'),(2::Int,'b')])) 3
   (Just (2,'b'),Nothing)
   
   >>> Nodes.lookup (Nodes.fromList ([(0,'a'),(2,'b'),(5::Int,'c')])) 3
   (Just (2,'b'),Just (5,'c'))
   

5. lookup :: (Eq a, Eq b) => [(a, b)] -> Maybe a <-> Maybe b

   invertible	Data.Invertible.List

   Bi-directional lookup.

6. lookup :: Ord k => Key ph k -> Map ph k v -> v

   justified-containers	Data.Map.Justified

   O(log n). Lookup the value at a key, known to be in the map. The result is a v rather than a Maybe v, because the proof obligation that the key is in the map must already have been discharged to obtain a value of type Key ph k.

7. lookup :: ByteString -> LabelMap a -> Maybe a

   keter	Keter.LabelMap

   No documentation available.

8. lookup :: (Eq a, Monad m) => a -> Stream m (a, b) -> m (Maybe b)

   leveldb-haskell	Data.Stream.Monadic

   No documentation available.

9. lookup :: Eq k => k -> AssociationList k a -> Maybe a

   mockcat	Test.MockCat.AssociationList

   No documentation available.

10. lookup :: MonadCache k v m => k -> m (Maybe v)

    monad-memo	Control.Monad.Memo.Class

    No documentation available.

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