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Within LTS Haskell 24.12 (ghc-9.10.3)

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Exact lookup

1. 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
   

2. 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
   

3. 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
   

4. lookupMax :: Set a -> Maybe a

   rio	RIO.Set

   The maximal element of a set.

5. lookupMin :: Set a -> Maybe a

   rio	RIO.Set

   The minimal element of a set.

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

   HTTP	Network.HTTP.Headers

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

7. lookupJustDef :: Eq a => b -> a -> [(a, b)] -> b

   errors	Control.Error

   No documentation available.

8. lookupIndex :: (HashTable h, Eq k, Hashable k) => h s k v -> k -> ST s (Maybe Word)

   hashtables	Data.HashTable.Class

   Looks up the index of a key-value mapping in a hash table suitable for passing to nextByIndex.

9. lookupIndex :: (HashTable h, Eq k, Hashable k) => IOHashTable h k v -> k -> IO (Maybe Word)

   hashtables	Data.HashTable.IO

   See the documentation for this function in lookupIndex.

10. lookupIndex :: (Hashable k, Eq k) => HashTable s k v -> k -> ST s (Maybe Word)

    hashtables	Data.HashTable.ST.Cuckoo

    Find index of given key in the hashtable.

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