Add (<$$>) to Functor. #20509
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Add (<$$>) to Functor. #20509
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yangzai
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Useful for manipulating
Optionals or lists nested inUpdate/Scriptwe often get from the query/fetch/lookup functions (in the absence of functor composition or monad transformers).In general, it would still be useful for all effectful functions in the Kleisli form. Sometimes
(<=<)is an over kill, and it wouldn't even work for non-monadic applicatives likeCommandsandValidation.The fixity follows the version from https://hackage.haskell.org/package/composition-extra-2.1.0/docs/Data-Functor-Syntax.html .