Hoogle Search

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Exact lookup

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

   containers	Data.Map.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
   

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

   containers	Data.Map.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
   

3. lookupGE :: Ord k => k -> Map k v -> Maybe (k, v)

   containers	Data.Map.Lazy

   Find smallest key greater or equal to the given one and return the corresponding (key, value) pair.

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

4. lookupGT :: Ord k => k -> Map k v -> Maybe (k, v)

   containers	Data.Map.Lazy

   Find smallest key greater than the given one and return the corresponding (key, value) pair.

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

5. lookupIndex :: Ord k => k -> Map k a -> Maybe Int

   containers	Data.Map.Lazy

   Lookup the index of a key, which is its zero-based index in the sequence sorted by keys. The index is a number from 0 up to, but not including, the size of the map.

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

6. lookupLE :: Ord k => k -> Map k v -> Maybe (k, v)

   containers	Data.Map.Lazy

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

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

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

   containers	Data.Map.Lazy

   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')
   

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

   containers	Data.Map.Lazy

   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
   

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

   containers	Data.Map.Lazy

   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
   

10. lookupGE :: Ord k => k -> Map k v -> Maybe (k, v)

    containers	Data.Map.Strict

    Find smallest key greater or equal to the given one and return the corresponding (key, value) pair.

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

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