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GHC 10.0.0.20260917 · lts/ghc-10.0.x · 8fef28d · 2026-11-02

Moduleoptics-core-0.4.2Haskell2010

Optics.Core.Extras

Synopsis

value is

Packageoptics-core-0.4.2
Exports1
LanguageHaskell2010
LicenceBSD-3-Clause
SourceExtras.hs

valueis :: Is k An_AffineFold => Optic' k is s a -> s -> Bool

Check to see if this AffineFold matches.

Example1 expression

>>> is _Just NothingFalse