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

Tue, 22 Nov 2005 10:40:21 -0800 


On Tue, 22 Nov 2005, Matthias Neubauer wrote:


Arjan van IJzendoorn <[EMAIL PROTECTED]> 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
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