Hoogle Search

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Exact lookup

1. lookupLT :: Ord k => k -> Map k v -> Maybe (k, v)

   containers	Data.Map.Strict.Internal

   Find largest key smaller than the given one and return the corresponding (key, value) pair.

   lookupLT 3 (fromList [(3,'a'), (5,'b')]) == Nothing
   lookupLT 4 (fromList [(3,'a'), (5,'b')]) == Just (3, 'a')
   

2. lookupMax :: Map k a -> Maybe (k, a)

   containers	Data.Map.Strict.Internal

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

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

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

   containers	Data.Map.Strict.Internal

   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
   

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

   containers	Data.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
   

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

   containers	Data.Set

   Find smallest element greater than the given one.

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

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

   containers	Data.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
   

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

   containers	Data.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
   

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

   containers	Data.Set

   Find largest element smaller than the given one.

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

9. lookupMax :: Set a -> Maybe a

   containers	Data.Set

   The maximal element of a set.

10. lookupMin :: Set a -> Maybe a

    containers	Data.Set

    The minimal element of a set.

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