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Last active December 29, 2015 00:49
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Playing with the _Cons prism and beside from Control.Lens.Traversal.
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gistfile1.hs
import Control.Lens
import Data.Char
over (_Cons.beside id each) toUpper "aa"
over (_Cons.beside id each) toUpper "" -- works fine, too.
-- the "aside" prism is pretty sweet, too!
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