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Exact lookup

1. lookupResponseHeader :: forall (h :: Symbol) a (headers :: [Type]) r . HasResponseHeader h a headers => Headers headers r -> ResponseHeader h a

   gogol-core	Gogol.Prelude

   Look up a specific ResponseHeader, without having to know what position it is in the HList.

   >>> let example1 = addHeader 5 "hi" :: Headers '[Header "someheader" Int] String
   
   >>> let example2 = addHeader True example1 :: Headers '[Header "1st" Bool, Header "someheader" Int] String
   
   >>> lookupResponseHeader example2 :: ResponseHeader "someheader" Int
   Header 5
   

   >>> lookupResponseHeader example2 :: ResponseHeader "1st" Bool
   Header True
   

   Usage of this function relies on an explicit type annotation of the header to be looked up. This can be done with type annotations on the result, or with an explicit type application. In this example, the type of header value is determined by the type-inference, we only specify the name of the header:

   >>> :set -XTypeApplications
   
   >>> case lookupResponseHeader @"1st" example2 of { Header b -> b ; _ -> False }
   True
   

2. lookupEnv :: MonadIO m => String -> m (Maybe String)

   unliftio	UnliftIO.Environment

   Lifted lookupEnv.

3. lookupJust :: (Eq a, Partial) => a -> [(a, b)] -> b

   safe	Safe

   lookupJust key = fromJust . lookup key
   

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

   safe	Safe

   No documentation available.

5. lookupJustNote :: (Partial, Eq a) => String -> a -> [(a, b)] -> b

   safe	Safe

   No documentation available.

6. lookupEnv :: String -> IO (Maybe String)

   base-compat	System.Environment.Compat

   Return the value of the environment variable var, or Nothing if there is no such value. For POSIX users, this is equivalent to getEnv.

7. lookupResponseHeader :: forall (h :: Symbol) a (headers :: [Type]) r . HasResponseHeader h a headers => Headers headers r -> ResponseHeader h a

   servant	Servant.API

   Look up a specific ResponseHeader, without having to know what position it is in the HList.

   >>> let example1 = addHeader 5 "hi" :: Headers '[Header "someheader" Int] String
   
   >>> let example2 = addHeader True example1 :: Headers '[Header "1st" Bool, Header "someheader" Int] String
   
   >>> lookupResponseHeader example2 :: ResponseHeader "someheader" Int
   Header 5
   

   >>> lookupResponseHeader example2 :: ResponseHeader "1st" Bool
   Header True
   

   Usage of this function relies on an explicit type annotation of the header to be looked up. This can be done with type annotations on the result, or with an explicit type application. In this example, the type of header value is determined by the type-inference, we only specify the name of the header:

   >>> :set -XTypeApplications
   
   >>> case lookupResponseHeader @"1st" example2 of { Header b -> b ; _ -> False }
   True
   

8. lookupResponseHeader :: forall (h :: Symbol) a (headers :: [Type]) r . HasResponseHeader h a headers => Headers headers r -> ResponseHeader h a

   servant	Servant.API.ResponseHeaders

   Look up a specific ResponseHeader, without having to know what position it is in the HList.

   >>> let example1 = addHeader 5 "hi" :: Headers '[Header "someheader" Int] String
   
   >>> let example2 = addHeader True example1 :: Headers '[Header "1st" Bool, Header "someheader" Int] String
   
   >>> lookupResponseHeader example2 :: ResponseHeader "someheader" Int
   Header 5
   

   >>> lookupResponseHeader example2 :: ResponseHeader "1st" Bool
   Header True
   

   Usage of this function relies on an explicit type annotation of the header to be looked up. This can be done with type annotations on the result, or with an explicit type application. In this example, the type of header value is determined by the type-inference, we only specify the name of the header:

   >>> :set -XTypeApplications
   
   >>> case lookupResponseHeader @"1st" example2 of { Header b -> b ; _ -> False }
   True
   

9. lookupAnchor :: AnchorName -> YamlParser (Maybe YamlValue)

   yaml	Data.Yaml.Parser

   No documentation available.

10. lookupByConstructorName :: Name -> DatatypeInfo -> ConstructorInfo

    th-abstraction	Language.Haskell.TH.Datatype

    Given a DatatypeInfo, find the ConstructorInfo corresponding to the Name of one of its constructors.

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