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Within LTS Haskell 24.35 (ghc-9.10.3)

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  1. lookup :: StaticMap t => Key t -> t -> Maybe (Val t)

    relude Relude.Extra.Map

    No documentation available.

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

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

    No documentation available.

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

    wreq Network.Wreq.Cache.Store

    No documentation available.

  4. 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

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

    enummapset Data.EnumMap.Lazy

    No documentation available.

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

    enummapset Data.EnumMap.Strict

    No documentation available.

  7. 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"

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

    ghc-internal GHC.Internal.Data.OldList

    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"

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

    ghc-internal GHC.Internal.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"

  10. lookup :: Eq a => a -> Infinite (a, b) -> b

    infinite-list Data.List.Infinite

    Find the first pair, whose first component is equal to the first argument, and return the second component. If there is nothing to be found, this function will hang indefinitely.

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