[Haskell-cafe] Lenses and Nested Maps

[David Feuer]

The main lensy tools for maps are the At and Ixed classes, both found in
Control.Lens.At.

On Mon, Jun 17, 2019, 11:45 PM Henry Laxen <nadine.and.henry at pobox.com>
wrote:

> Hi Cafe,
>
> Suppose I have:
>
> s :: Map String (Map Int Char)
> s =  M.fromList [("alice", M.fromList [(5,'a')]), ("bob", M.fromList
> [(6,'b')])]
>
> Is there any way to modify the 'b' entry easily using lenses?
>
> Thanks in advance.
> Best wishes,
> Henry Laxen
>
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