[Haskell-cafe] Lenses and Nested Maps

[Henry Laxen]

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