i had another question, how can i convert a List<ValidatedNel<Error, Result>> into `Val...

# arrow

[Pratik Tandel]

i had another question,

how can i convert a List<ValidatedNel<Error, Result>> into ValidatedNel<Error, List<Result>> — basically i’d like to aggregate all errors whenever it failed

[Pratik Tandel]

as opposed to failing first

[simon.vergauwen]

For this you should use the sequence operation. For 0.11.0 this should be a top-level function called traverse and you should pass NonEmpyList.semigroup as an argument

[Pratik Tandel]

is it this? https://arrow-kt.io/docs/apidocs/arrow-core/arrow.core/traverse-validated.html

[simon.vergauwen]

Yes, but that’s for 0.12.x and onwards

[simon.vergauwen]

For 0.11.0 it’s called sequence and it should be available as top level function on List

[Pratik Tandel]

i’m thinking i should just upgrade 🙂

looks like it doesn’t actually have a kt 1.5 dependency

[simon.vergauwen]

No, 0.12.0 is still on 1.4

[simon.vergauwen]

0.12.1**

[simon.vergauwen]

So is 0.13.0 btw

[simon.vergauwen]

Or 0.13.2

[simon.vergauwen]

It has the same api as Arrow 1.0.0 but is on Kotlin 1.4

[simon.vergauwen]

Ideally you could upgrade to that version

[Pratik Tandel]

ok awesome. i’ll get to 0.13.2 and try this tomorrow. ty so much for the help

[simon.vergauwen]

Happy to help any time @Pratik Tandel!

[Pratik Tandel]

Upgrading right now and have to say the change from either.left.a | either.left.b -> either.{left,right}.value makes sense but is kind of annoying to refactor 🙂

[simon.vergauwen]

If you go through 0.12.x there should be a refactor trough IntelliJ option through deprecation of the b value

[simon.vergauwen]

Sorry, I forgot to mention it before

[Pratik Tandel]

no worries i got it fixed. we’re in a large monorepo so it’s challenging to do that via intellij

[simon.vergauwen]

https://www.47deg.com/blog/arrow-0.13.0-release/

[Pratik Tandel]

Validated.applicativeNel seems to be gone?

[simon.vergauwen]

Can be replaced by zip