On Fri, 2011-04-22 at 22:11 +0200, Henning Thielemann wrote: > On Fri, 22 Apr 2011, Maciej Marcin Piechotka wrote: > > > On Fri, 2011-04-22 at 21:26 +0200, Henning Thielemann wrote: > >> > >> In idiomatic Haskell you would write > >> > >> case userList of > >> Nothing -> Nothing > >> Just plainUserList = > >> let user = findUser "bob" plainUserList > >> ... > >> > >> since (userList /= Nothing) requires an Eq instance without need and it > >> requires fromJust. Or was there an educational purpose to write it with > >> (/= Nothing) ? > > > > Using 'more advanced haskell' > > > > email = getEmail =<< findUser "bob" =<< userList > > This is what Christopher Done wrote some lines below the code, that I > quoted.
Ups. Sorry - I didn't have all the context. Regards
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