20 Dec
2022
20 Dec
'22
11:33 a.m.
On Tue, Dec 20, 2022 at 05:25:35PM +0100, PICCA Frederic-Emmanuel wrote:
Please clarify your question. Your code doesn't compile, and I can't tell what it's supposed to do.
replace a (Maybe a) value in a data using lens only if the new (Maybe a) is a Just
How about over a (mb <|>) ?