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Within LTS Haskell 24.4 (ghc-9.10.2)

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  1. lookup :: (Eq k, Hashable k) => k -> InsOrdHashMap k v -> Maybe v

    insert-ordered-containers Data.HashMap.Strict.InsOrd

    No documentation available.

  2. lookup :: (Ord k, Hashable k) => k -> Store k v -> Maybe (v, Store k v)

    wreq Network.Wreq.Cache.Store

    No documentation available.

  3. lookup :: CI ByteString -> Headers -> Maybe ByteString

    snap-core Snap.Types.Headers

    Look up the value of a given HTTP header field. Example: 

    ghci> :set -XOverloadedStrings
ghci> H.lookup "host" $ H.fromList [("Host", "localhost")]
Just "localhost"
ghci> H.lookup "Accept" $ H.fromList [("Host", "localhost")]
Nothing

  4. lookup :: Enum k => k -> EnumMap k a -> Maybe a

    enummapset Data.EnumMap.Lazy

    No documentation available.

  5. lookup :: Enum k => k -> EnumMap k a -> Maybe a

    enummapset Data.EnumMap.Strict

    No documentation available.

  6. lookup :: Ord k => k -> OMap k v -> Maybe v

    th-desugar Language.Haskell.TH.Desugar.OMap

    No documentation available.

  7. lookup :: Ord k => k -> OMap k v -> Maybe v

    th-desugar Language.Haskell.TH.Desugar.OMap.Strict

    No documentation available.

  8. lookup :: (Ord a, Ord b, MonadThrow m) => a -> Bimap a b -> m b

    bimap Data.Bimap

    O(log n). Lookup a left key in the bimap, returning the associated right key. This function will return the result in the monad, or fail if the value isn't in the bimap. Note that the signature differs slightly from Data.Map's lookup. This one is more general - it functions the same way as the "original" if m is cast (or inferred) to Maybe. Version: 0.2

  9. lookup :: (Val v, MonadFail m) => Label -> Document -> m v

    bson Data.Bson

    Lookup value of field in document and cast to expected type. Fail (Nothing) if field not found or value not of expected type.

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

    ghc-internal GHC.Internal.Data.List

    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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