from the previous solution and posts i can deduce this solution to concatanate N Maybe String, the function could be written: (+++) = \x y -> (++) <$> x <*> y this is basically equivalent to the previous one: (+++) = liftM2 (++) on f +++ mp +++ s i get results like: resBDstrFloat =Just "-04.3982" i will stay with those solutions. Le 08/01/2019 08:47, Tom Ellis a écrit :
On Mon, Jan 07, 2019 at 05:13:13PM +0100, Damien Mattei wrote:
just after in my code i have this to concatanate the two strings f and s that are the first and second element of the array: ... i do not want to do it using the hard way with case... of Just x -> nothing .........
Just do it the hard way and get some code that works. You can always "improve" it later if you like. "Hard" code that works is orders of magnitude more valuable that "easy" code that doesn't. _______________________________________________ Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post.
-- Damien.Mattei@unice.fr, Damien.Mattei@oca.eu, UNS / OCA / CNRS