Re: [Haskell-cafe] Shortening if-then-else

On Tue, 22 Nov 2005, Matthias Neubauer wrote:

Arjan van IJzendoorn writes:

...

...

Is there a shorter way to write the if-then-else part below? if (cmdType cmd) /= (CmdSitError Server) then return $ Just seat_num else return Nothing

return $ if cmdType cmd /= CmdSitError Serv then Just seat_num else Nothing

return $ guard (cmdType cmd /= CmdSitError Serv) >> return seat_num

Because I often need it, I'm used to use my private function 'toMaybe' return $ toMaybe (cmdType cmd /= CmdSitError Serv) seat_num