Is there a `filterOrElse` equivalent for BIO? Curr...

# arrow

[Gopal S Akshintala]

Is there a filterOrElse equivalent for BIO?
Currently I had to write like this to set BIO to left of right state based on a boolean result (which feels boilerplate)

val example: (IO<String, Int>) -> IO<String, Any?> =
                { valueIO ->
                    valueIO.map(::someBooleanResult)
                            .flatMap { if (it) IO.just(it) else IO.raiseError("error") }
                }

[simon.vergauwen]

No, there is no filterOrElse available in BIO.
I’m not sure if you missed it but, we’re going to revert BIO since we came up with a better and more powerful encoding!

This will also completely solve your problem of effectful validation.

https://github.com/arrow-kt/arrow-fx/pull/169

[Gopal S Akshintala]

Oh! thanks @simon.vergauwen, I briefly grazed through it! Also waiting for ur Kotliners talk to learn more about it. Hope you will keep us posted when it is online! Thanks for this significant enhancement!

[simon.vergauwen]

I definitely will. I expect it to be published very soon!

[simon.vergauwen]

@Gopal S Akshintala

https://www.youtube.com/watch?v=6sw8GAhUJz0▾

😉

[Gopal S Akshintala]

Thank you 😊

[simon.vergauwen]

There is Either.catch which is like attempt but for suspend.

If you want to flattenEither it's safe to simply throw inside suspend, which would be the same as attempting and flattening.
Beside that Either has the same MonadError API as IO for recovering errors.