lenz-0.1: Van Laarhoven lenses
Data.Lens
type Lens α β a b = Refractor ((~) (->)) Functor α β a b Source
lens :: (α -> a) -> (b -> α -> β) -> Lens α β a b Source
iso :: (α -> a) -> (b -> β) -> Lens α β a b Source
get :: Lens α β a b -> α -> a Source
set :: Lens α β a b -> b -> α -> β Source
modify :: Lens α β a b -> (a -> b) -> α -> β Source
fstL :: Lens (a, c) (b, c) a b Source
sndL :: Lens (a, b) (a, c) b c Source
swapL :: Lens (a, b) (c, d) (b, a) (d, c) Source