Hoogle Search

Within LTS Haskell 24.65 (ghc-9.10.3)

Note that Stackage only displays results for the latest LTS and Nightly snapshot. Learn more.

Exact lookup

1. lookupMin :: Map k a -> Maybe (k, a)

   rio	RIO.Map

   The minimal key of the map. Returns Nothing if the map is empty.

   lookupMin (fromList [(5,"a"), (3,"b")]) == Just (3,"b")
   lookupMin empty = Nothing
   

2. lookupEnvFromContext :: (MonadReader env m, HasProcessContext env) => Text -> m (Maybe Text)

   rio	RIO.Process

   Look into the ProcessContext and return the specified environmet variable if one is available.

3. lookupGE :: Ord a => a -> Set a -> Maybe a

   rio	RIO.Set

   Find smallest element greater or equal to the given one.

   lookupGE 3 (fromList [3, 5]) == Just 3
   lookupGE 4 (fromList [3, 5]) == Just 5
   lookupGE 6 (fromList [3, 5]) == Nothing
   

4. lookupGT :: Ord a => a -> Set a -> Maybe a

   rio	RIO.Set

   Find smallest element greater than the given one.

   lookupGT 4 (fromList [3, 5]) == Just 5
   lookupGT 5 (fromList [3, 5]) == Nothing
   

5. lookupIndex :: Ord a => a -> Set a -> Maybe Int

   rio	RIO.Set

   Lookup the index of an element, which is its zero-based index in the sorted sequence of elements. The index is a number from 0 up to, but not including, the size of the set.

   isJust   (lookupIndex 2 (fromList [5,3])) == False
   fromJust (lookupIndex 3 (fromList [5,3])) == 0
   fromJust (lookupIndex 5 (fromList [5,3])) == 1
   isJust   (lookupIndex 6 (fromList [5,3])) == False
   

6. lookupLE :: Ord a => a -> Set a -> Maybe a

   rio	RIO.Set

   Find largest element smaller or equal to the given one.

   lookupLE 2 (fromList [3, 5]) == Nothing
   lookupLE 4 (fromList [3, 5]) == Just 3
   lookupLE 5 (fromList [3, 5]) == Just 5
   

7. lookupLT :: Ord a => a -> Set a -> Maybe a

   rio	RIO.Set

   Find largest element smaller than the given one.

   lookupLT 3 (fromList [3, 5]) == Nothing
   lookupLT 5 (fromList [3, 5]) == Just 3
   

8. lookupMax :: Set a -> Maybe a

   rio	RIO.Set

   The maximal element of a set.

9. lookupMin :: Set a -> Maybe a

   rio	RIO.Set

   The minimal element of a set.

10. lookupHeader :: HeaderName -> [Header] -> Maybe String

    HTTP	Network.HTTP.Headers

    lookupHeader hdr hdrs locates the first header matching hdr in the list hdrs.

Page 70 of many | Previous | Next