>And sometimes I want to update a single one of those "still other things".

>Lenses seem like a good solution

Lenses are the best solution currently available. If you're worried about this being inefficient due to immutability... don't be. Due to laziness (and more general compiler optimizations), GHC can do this efficiently.

On 05/15/2018 04:00 PM, Dennis Raddle wrote:

And sometimes I want to update a single one of those "still other things".