I was away from Arrow for some time and two days ago I came across `Effect`. can somebody give me co...

# arrow

[Marko Novakovic]

I was away from Arrow for some time and two days ago I came across Effect. can somebody give me concrete example where difference between Effect and Either is clear?

[stojan]

Maybe this helps: https://nomisrev.github.io/continuation-monad-in-kotlin/

[stojan]

There is also this: https://stackoverflow.com/questions/72277426/which-should-we-choose-between-effect-and-either-as-a-return-type-of-our-busines

[Marko Novakovic]

read the blog post, not completely clear but I understood most about Effect from there

[Marko Novakovic]

Stack Overflow answer answers it for me, thanks

[raulraja]

Rather than Effect vs Either with multiple context receiver is more about EffectScope<E> vs Either<E, *>.

[raulraja]

with multiple context receivers you can use the EffectScope to make Either disappear.

context(EffectScope<E>)
suspend fun <E, A> foo(): A = shift(e)

vs

suspend fun <E, A> foo(): Either<E, A> = Left(e)

[raulraja]

With EffectScope you can use shift as a functional throw which can return an alternative value of E when otherwise the happy path of your function return type remains simple as just A

[Marko Novakovic]

interesting, thanks for the explanation. that really looks neat