Re: [Haskell-cafe] Lenses and Nested Maps

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 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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