[Haskell-cafe] Quick question on Lens

[Niklas Haas]

On Sun, 4 May 2014 22:34:34 +0200, Corentin Dupont <corentin.dupont at gmail.com> wrote:
> Hello!
> I have a record like this:
> 
> data A = { _bs :: [B]}
> 
> funcA :: State A ()
> funcA = bs ??? funcB
> 
> funcB :: State B ()
> funcB = ...
> 
> What lens operator should I use instead of ???, to update all my Bs?
> 
> Cheers,
> Corentin

zoom (bs.traverse) :: State B () -> State A ()