preface

An opinionated library for function programming (à La Haskell)
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Library preface.specs
type 'a t

The type held by the Selective.

val branch : ( 'a, 'b ) Preface_core.Shims.Either.t t -> ( 'a -> 'c ) t -> ( 'b -> 'c ) t -> 'c t

branch is like select. It chooses between two effects.