Optics.Review

A Review is a backwards Getter, i.e. a Review T B is just a function B -> T.

Formation

type Review t b = Optic' A_Review NoIx t b

Type synonym for a review.

Introduction

unto :: (b -> t) -> Review t b

An analogue of to for reviews.

Elimination

review :: Is k A_Review => Optic' k is t b -> b -> t

Retrieve the value targeted by a Review.

>>> review _Left "hi"
Left "hi"

Computation

review (unto f) = f

Subtyping

data A_Review :: OpticKind

Tag for a review.

Instances

ReversibleOptic A_Review

Defined in Optics.Re

Associated Types

type ReversedOptic A_Review = (r :: Type)

Methods

re :: AcceptsEmptyIndices "re" is => Optic A_Review is s t a b -> Optic (ReversedOptic A_Review) is b a t s

Is A_ReversedLens A_Review

Defined in Optics.Internal.Optic.Subtyping

Methods

implies :: (Constraints A_ReversedLens p -> r) -> Constraints A_Review p -> r

Is A_Prism A_Review

Defined in Optics.Internal.Optic.Subtyping

Methods

implies :: (Constraints A_Prism p -> r) -> Constraints A_Review p -> r

Is An_Iso A_Review

Defined in Optics.Internal.Optic.Subtyping

Methods

implies :: (Constraints An_Iso p -> r) -> Constraints A_Review p -> r

(Functor f, f ~ g, s ~ t, a ~ b) => MappingOptic A_Review f g s t a b

Defined in Optics.Mapping

Associated Types

type MappedOptic A_Review :: Type

Methods

mapping :: AcceptsEmptyIndices "mapping" is => Optic A_Review is s t a b -> Optic (MappedOptic A_Review) is (f s) (g t) (f a) (g b)

type ReversedOptic A_Review

Defined in Optics.Re

type ReversedOptic A_Review = A_Getter

type MappedOptic A_Review

Defined in Optics.Mapping

type MappedOptic A_Review = A_Review