Hi, can you show me an example of how to use zipOrAccumulate method using coroutines? Just basic accumulation of 2/3 eithers and returning lefts (or all lefts merged into single object) if there's any.

let’s suppose you have the following scenario:

data class Person(val name: String, val age: Int)

sealed interface Problem {
  object NameProblem
  object AgeProblem
}

fun validName(name: String): Either<NameProblem, String> = TODO()
fun validAge(age: Int): Either<AgeProblem, Int> = TODO()

Here

validName

and

validAge

can also be

suspend

, and

Either.zipOrAccumulate(validName(age), validAge(age)) { n, a -> Person(n, a) }

also exists. The benefit of the DSL version that Alejandro showed is that it works for both

Either<NonEmptyList<E>, A>

and

Either<E, A>

in a single DSL. Whilst with the

Either.zipOrAccumulate

version you can only combine

Either

of the same type and need to manually call

toEitherNel()

to turn

Either<E, A>

into

Either<NonEmptyList<E>, A>

.

Thank you! So easy!