HORIZON HASKELLDocslts/ghc-9.10.x248f8f02026-10-05Search names, modules, packages, or :: a typeCtrl K

GHC 9.10.3 · lts/ghc-9.10.x · 248f8f0 · 2026-10-05

Modulelens-5.3.5Haskell2010

Control.Lens.Extras

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

  • 1 value
  • Packagelens-5.3.5
  • Exports1
  • LanguageHaskell2010
  • LicenceBSD-2-Clause
  • SourceExtras.hs
valueis :: APrism s t a b -> s -> Bool
#

Check to see if this Prism matches.

Example1 expression
is _Left (Right 12)False
Example1 expression
is hex "3f79"True

module Data.Data.Lens