papa-lens-implement-0.3.1: useful `lens` functions reimplemented
Papa.Lens.Implement.Data.List
head :: Cons s s a a => s -> Maybe a Source #
tail :: Cons s s a a => s -> Maybe s Source #
last :: Snoc s s a a => s -> Maybe a Source #
init :: Snoc s s a a => s -> Maybe s Source #
(!!) :: Ixed s => s -> Index s -> Maybe (IxValue s) infixl 9 Source #