Please clarify your question. Your code doesn't compile, and I can't tell what it's supposed to do. On Tue, Dec 20, 2022, 11:13 AM PICCA Frederic-Emmanuel < frederic-emmanuel.picca@synchrotron-soleil.fr> wrote:
Hello,
I have a data whcih contain a Maybe value
data A = A (_a = Maybe a)
I would like to use a lens in order to merge two values with this log
replace the value only if it is a (Just a)
So My question is
is there something more elegant than
let myA' = case ma of Nothing -> conf (Just na) -> (a .~ na) myA
Thanks for your help
Frederic _______________________________________________ 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.