optics-core-0.3.0.1: Optics as an abstract interface: core definitions

Safe HaskellNone
LanguageHaskell2010

Data.Maybe.Optics

Description

This module defines Prisms for the constructors of the Maybe datatype.

Synopsis

Documentation

_Nothing :: Prism' (Maybe a) () Source #

A Prism that matches on the Nothing constructor of Maybe.

_Just :: Prism (Maybe a) (Maybe b) a b Source #

A Prism that matches on the Just constructor of Maybe.