Hi, is there any “flatMap-ish” equivalent for `Val...

# arrow

[Jakub Gwóźdź]

Hi, is there any “flatMap-ish” equivalent for Validated.zip(...)? Where the last parameter (combining function) also returns ValidatedNel, not the resulting value?

[simon.vergauwen]

Not out of the box 🤔

Your use-case is validating individual values, and then validating them together as a group?

Can you share a snippet?

[Jakub Gwóźdź]

Can't share a snippet during weekend 🙂 but that's exactly the case. I get val a: ValidatedNel<E,A> from one source and val b: ValidatedNel<E,B> from another. But cannot simply combine them in val c = a.zip(b,::f), because result can also fail for certain conditions from a and b.
What I went with is val c = a.zip(b, ::Pair).andThen{(a,b)->f(a,b)}.