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Within LTS Haskell 24.60 (ghc-9.10.3)

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  1. lookup :: Ord p => p -> LexTree p a -> Maybe a

    calligraphy Calligraphy.Util.LexTree

    No documentation available.

  2. lookup :: Uniquable a => a -> UniqMap b -> Maybe b

    clash-lib Clash.Data.UniqMap

    Lookup an item in the map, using the unique of the given key.

  3. lookup :: Ord k => k -> CompactMap k v -> Maybe v

    compactmap Data.CompactMap

    No documentation available.

  4. lookup :: forall (vec :: Type -> Type) v k . (Vector vec v, Ord k) => k -> CompactMap vec k v -> Maybe v

    compactmap Data.CompactMap.Generic

    No documentation available.

  5. lookup :: FromField a => NamedRecord -> ByteString -> Parser a

    csv-conduit Data.CSV.Conduit.Conversion

    Retrieve a field in the given record by name. The result is empty if the field is missing or if the value cannot be converted to the desired type.

  6. lookup :: (Eq k, Hashable k) => k -> Map k v -> IO (Maybe v)

    ctrie Control.Concurrent.Map

    O(log n). Return the value associated with the given key, or Nothing.

  7. lookup :: Ord k => k -> IntervalMap k a -> Maybe a

    data-interval Data.IntervalMap.Lazy

    Lookup the value at a key in the map. The function will return the corresponding value as (Just value), or Nothing if the key isn't in the map.

  8. lookup :: Ord k => k -> IntervalMap k a -> Maybe a

    data-interval Data.IntervalMap.Strict

    Lookup the value at a key in the map. The function will return the corresponding value as (Just value), or Nothing if the key isn't in the map.

  9. lookup :: Int -> DEPQ p v -> Maybe (p, v)

    depq Data.DEPQ

    Lookup a key

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

    dimensional Numeric.Units.Dimensional.Prelude

    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"

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