how can i get the stacktrace of an error in functional style? throwing exception is not a right thin...

# functional

[Mazhar Ibna Zahur]

how can i get the stacktrace of an error in functional style? throwing exception is not a right thing in FP.

[Ties]

You could use Kotlins Result type, or the Either type from Arrow (or the fancy new solution with context receivers), or build your own Result type that contains an exception 🙂

[Ties]

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-result/, https://thekotlindev.com/2021/kotlin-result-pattern/

[simon.vergauwen]

https://github.com/arrow-kt/arrow/pull/2816

This PR has been open for some time, and it solves the issue for 90%... I am still trying to get feedback on it.

90% in the sense that it can track the bind() or raise that failed the issue but if you reify into a couple intermediate values in between than it can only track up until the latest point that actually "raised" or short-circuited the DSL.

[simon.vergauwen]

Any, or all feedback would be greatly appreciated! I think this is still a great feature to have in Arrow, since it can greatly improve the situation of working with functional errors.

[Mazhar Ibna Zahur]

thank you guys

[Ties]

No worries 🙂 let me know if you need any help

[wakingrufus]

for a more generic look at the concept, check out: https://fsharpforfunandprofit.com/posts/recipe-part2/

[Ties]

Scott Wlaschin ❤️