I’m migrating an old codebase from 1.1.5 to 2.1.2....

# arrow

[jean]

I’m migrating an old codebase from 1.1.5 to 2.1.2. What’s a good replacement for parTraverse ? I see the migration guide recommands mapOrAccumulate but does it have the parrallelle capabilities too?

[simon.vergauwen]

Hey @jean,
Arrow Fx Coroutines offers parMapOrAccumulate as a more powerful operator instead of parTraverse

[jean]

Ok, I’m probably missing a dependency then, my IDE couldn’t find anything. Thanks!

[simon.vergauwen]

implementation("io.arrow-kt:arrow-fx-coroutines:2.1.2") it's included in this one.

[jean]

Hi Simon! What’s the way of converting a List<Either<L, R>> to a Either<L, List<R>> with 2.x? I see in a previous thread that you recommended sequenceEither , is that still the correct way? I can’t find it in the documentation

[simon.vergauwen]

https://apidocs.arrow-kt.io/arrow-core/arrow.core/flatten-or-accumulate.html

[jean]

Thanks!