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Exact lookup

1. lookupAll :: Text -> Form -> [Text]

   http-api-data	Web.FormUrlEncoded

   Find all values corresponding to a given key in a Form.

   >>> lookupAll "name" []
   []
   
   >>> lookupAll "name" [("name", "Oleg")]
   ["Oleg"]
   
   >>> lookupAll "name" [("name", "Oleg"), ("name", "David")]
   ["Oleg","David"]
   

2. lookupMaybe :: Text -> Form -> Either Text (Maybe Text)

   http-api-data	Web.FormUrlEncoded

   Lookup an optional value for a key. Fail if there is more than one value.

   >>> lookupMaybe "name" []
   Right Nothing
   
   >>> lookupMaybe "name" [("name", "Oleg")]
   Right (Just "Oleg")
   
   >>> lookupMaybe "name" [("name", "Oleg"), ("name", "David")]
   Left "Duplicate key \"name\""
   

3. lookupUnique :: Text -> Form -> Either Text Text

   http-api-data	Web.FormUrlEncoded

   Lookup a unique value for a key. Fail if there is zero or more than one value.

   >>> lookupUnique "name" []
   Left "Could not find key \"name\""
   
   >>> lookupUnique "name" [("name", "Oleg")]
   Right "Oleg"
   
   >>> lookupUnique "name" [("name", "Oleg"), ("name", "David")]
   Left "Duplicate key \"name\""
   

4. lookupAll :: Text -> Form -> [Text]

   http-api-data	Web.Internal.FormUrlEncoded

   Find all values corresponding to a given key in a Form.

   >>> lookupAll "name" []
   []
   
   >>> lookupAll "name" [("name", "Oleg")]
   ["Oleg"]
   
   >>> lookupAll "name" [("name", "Oleg"), ("name", "David")]
   ["Oleg","David"]
   

5. lookupMaybe :: Text -> Form -> Either Text (Maybe Text)

   http-api-data	Web.Internal.FormUrlEncoded

   Lookup an optional value for a key. Fail if there is more than one value.

   >>> lookupMaybe "name" []
   Right Nothing
   
   >>> lookupMaybe "name" [("name", "Oleg")]
   Right (Just "Oleg")
   
   >>> lookupMaybe "name" [("name", "Oleg"), ("name", "David")]
   Left "Duplicate key \"name\""
   

6. lookupUnique :: Text -> Form -> Either Text Text

   http-api-data	Web.Internal.FormUrlEncoded

   Lookup a unique value for a key. Fail if there is zero or more than one value.

   >>> lookupUnique "name" []
   Left "Could not find key \"name\""
   
   >>> lookupUnique "name" [("name", "Oleg")]
   Right "Oleg"
   
   >>> lookupUnique "name" [("name", "Oleg"), ("name", "David")]
   Left "Duplicate key \"name\""
   

7. lookupBoundedEnumOf :: (Bounded a, Enum a, Eq b) => (a -> b) -> b -> Maybe a

   http-api-data	Web.Internal.HttpApiData

   Lookup values based on a precalculated mapping of their representations.

8. lookupAsc :: TrieSet v -> [Int] -> v

   regex-tdfa	Text.Regex.TDFA.IntArrTrieSet

   This is the accessor for the Trie. The list of keys should be sorted.

9. lookupAttr :: Name -> Element -> Maybe Text

   haskell-gi	Data.GI.GIR.XMLUtils

   Lookup an attribute for an element (with no prefix).

10. lookupAttrWithNamespace :: GIRXMLNamespace -> Name -> Element -> Maybe Text

    haskell-gi	Data.GI.GIR.XMLUtils

    Lookup an attribute for an element, given the namespace where it lives.

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