lens-4.1.2: Lenses, Folds and Traversals

Portabilityportable
Stabilityprovisional
MaintainerEdward Kmett <ekmett@gmail.com>
Safe HaskellNone

Control.Lens.Extras

Description

A few extra names that didn't make it into Control.Lens.

Synopsis

Documentation

is :: APrism s t a b -> s -> BoolSource

Check to see if this Prism matches. 

>>> is _Left (Right 12)
False

>>> is hex "3f79"
True

module Data.Data.Lens