Haskell Language Record Syntax RecordWildCards
Example
{-# LANGUAGE RecordWildCards #-}
data Client = Client { firstName :: String
, lastName :: String
, clientID :: String
} deriving (Show)
printClientName :: Client -> IO ()
printClientName Client{..} = do
putStrLn firstName
putStrLn lastName
putStrLn clientID
The pattern Client{..} brings in scope all the fields of the constructor Client, and is equivalent to the pattern
Client{ firstName = firstName, lastName = lastName, clientID = clientID }
It can also be combined with other field matchers like so:
Client { firstName = "Joe", .. }
This is equivalent to
Client{ firstName = "Joe", lastName = lastName, clientID = clientID }
