I'm experimenting with Arrow's `raise()` functionality and I try to find a library function similar ...

# functional

[Norbi]

I'm experimenting with Arrow's raise() functionality and I try to find a library function similar to the following hypothetical orElse() :

context(Raise<String>)
fun f1() = 1

context(Raise<String>)
fun f2(): Nothing = raise("error")

suspend inline fun <R, A> Effect<R, A>.orElse(noinline block: suspend (R) -> A) =
    fold(
        recover = block,
        transform = ::identity
    )

val v1 = effect { f1() }.orElse { 33 }
assertEquals(1, v1)

val v2 = effect { f2() }.orElse { 33 }
assertEquals(33, v2)

I use arrow 1.1.6-alpha.36.
Thanks.

[simon.vergauwen]

Such an API doesn't exist yet 🤔 but would be welcomed!
I think the signature should probably be getOrElse(onRaise: (R) -> A): A. To be in line with other operators and Kotlin Std.

A PR would be awesome, or a issue 🙏

[simon.vergauwen]

You can do either { f1() }.getOrElse { 33 } though.

[simon.vergauwen]

That would work in your case here without ever even needing suspend

[Norbi]

without ever even needing suspend

Really, thanks.
(TBH I'm a little bit confused when I look at the sources because Idea often takes me to the wrong source codes. When I start at browsing Raise<R> I often end up at functions related to arrow.core.continuations.Effect for some reason 😕 )

[simon.vergauwen]

That is really strange.. I have some issues with browsing code in IDEA. I can almost never see code from dependencies 😕 I know some issues have been reported about this but not sure where it stands.

[Norbi]

I filed an issue: https://github.com/arrow-kt/arrow/issues/2953