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danidiaz/viewwithoutlens.hs

Last active August 29, 2015 13:56
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viewwithoutlens.hs
-- view
getConst . _env Const $ shell "foo.bat"
-- over
runIdentity . _1 (Identity . (+1)) $ (1,1)
-- a fold (?)
getConst . _Nothing (\x -> Const [x]) $ Just 'a'
-- a prism (?)
getFirst . getConst . _Nothing (Const . First . Just) $ Just 'a'
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