I don't use fromJust in my code. However, fromJust is incredibly handy when working in ghci. Say I have parse :: String -> Maybe Value process :: Value -> IO () Then (process . fromJust . parse) is the fastest way to compose the two. So I'm -1 on dropping fromJust, but I don't object to adding a deprecation warning to it. Then again, why aren't we doing the same to head&tail? On 24/02/15 07:42, Erik de Castro Lopo wrote:
Hi all,
We currently have in the Data.Maybe module from base:
fromJust :: Maybe a -> a
which newbies often find using hoogle or other search tools and is a huge trap. *Every* usage of the above can be replaced by using
fromMaybe :: a -> Maybe a -> a
which forces the user to provide a default value for the case where the Maybe a is a Nothing.
The idea would be to deprecate fromMaybe for 7.12 and remove it completely later.
Comments?
Erik