<https://medium.com/@jcamilorada/arrow-try-is-dead...

# feed

[Juan Rada]

https://medium.com/@jcamilorada/arrow-try-is-dead-long-live-kotlin-result-5b086892a71e

[uhe]

But you still can't use kotlin.Result as return type...

[kioba]

https://kotlinlang.slack.com/archives/C5UPMM0A0/p1573986451274900?thread_ts=1573986034.271500&amp;cid=C5UPMM0A0

[suresh]

@uhe what was the reasoning behind that restriction ?

[uhe]

@suresh https://github.com/Kotlin/KEEP/blob/master/proposals/stdlib/result.md#limitations

[janvladimirmostert]

i've started using Either in one project and i quite like that you can effectively throw an exception without the performance penalty, instead of throw PEBKACError()) , it 's now just Either.left(PEBKACError())

Optics is the next Arrow feature i'm slowly adding to this project

[doker]

@janvladimirmostert if you dont need stacktraces - disable them: class FastException: Exception() { override fun fillInStackTrace() = null } and 99.5% of performance penalty is magically gone. In many cases throwing such exception will perform almost like GOTO

[janvladimirmostert]

oh wow

[janvladimirmostert]

If i don't know what the exception type is, then it would still be useful to have the stacktrace, but that's a really handy feature