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Today's Topics:
1. Re: Functor instance (Sumit Raja)
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Message: 1
Date: Sun, 4 Mar 2018 18:34:27 +1100
From: Sumit Raja <[email protected]>
To: [email protected]
Subject: Re: [Haskell-beginners] Functor instance
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<CAD4nrSexJ0TXDmTGUsdHdUyiYny7gYaMrh57j_hD=zsqo0y...@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
> I'm trying to implement my own Result type (and yes, I'm aware you can
> abuse Either for this :-) ) but doing something as (seemingly?) simple
> as implementing a Functor instance was surprisingly difficult.
>
Without knowing your final use case are Bifunctors what you are after
(https://hackage.haskell.org/package/base-4.10.1.0/docs/Data-Bifunctor.html)?
I used them when I wanted to fmap Left to convert errors to other
errors.
-Sumit
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