Can anyone point me to some documentation or examples of how to obtain a `Both` so that I might accu...

# arrow

[Carter Hudson]

Can anyone point me to some documentation or examples of how to obtain a Both so that I might accumulate non-fatal errors along with results?

[Carter Hudson]

I read all the documentation I could find, but there were no examples of using ior { … } or generating a Both 😕

[Carter Hudson]

Is there a way to generate something like Both<List<Throwable>, SomeResult>?

[dave08]

I think someone previously asked this kind of question on this channel...

[dave08]

https://kotlinlang.slack.com/archives/C5UPMM0A0/p1712571210437449

[Sam Pengilly]

There's not really any nice DSL APIs for this at the moment AFAIK, I can't remember if it's just super clunky but doable or not even possible with the currently exposed APIs. Without context parameters, the current structure of extension functions within the Raise/IorRaise scopes can't really be extended outside the library.

I put this PR up a while ago which starts to make the APIs a little more usable: https://github.com/arrow-kt/arrow/pull/3409 but I don't believe there's been a release since it was merged.

There's also this PR which adds a bit more high level support for mapping over a list, accumulating any errors that occur during the mapping of each item (i.e. mapOrAccumulate behaves differently depending on whether it's used in an either scope or an ior scope): https://github.com/arrow-kt/arrow/pull/3472

But this similar PR from Alejandro looks more promising and more explicit than my approach: https://github.com/arrow-kt/arrow/pull/3436

[Carter Hudson]

Thanks for the thorough responses; I really appreciate it. I thought maybe it was a failure of due diligence on my part, but I guess ior is just in a weird place right now.