hi, I have the need to call a suspending function ...

# arrow

[Tristan Blakers]

hi, I have the need to call a suspending function from Either.flatMap()

I understand the recommendation to use IO in this case, however I'm not a big fan of using Throwable as the error type, rather than my own sealed class. Is there anything particularly wrong with working around this via an extension function? i.e.

suspend fun <A, B, C> EitherOf<A, B>.flatMapSuspend(f: suspend (B) -> Either<A, C>): Either<A, C> =
    fix().let {
        when (it) {
            is Either.Right -> f(it.b)
            is Either.Left -> it
        }
    }

[Youssef Shoaib [MOD]]

You could probably use an IO of Either with a transformer

[than_]

either{
    someEither.bind().let{ someSuspendingStuff(it) }.bind()
}

this works 🙂

[Tristan Blakers]

thank you - the new either {} syntax is wonderful