How to convert this list `val eitherList: List<Either<Exception, String>> = TODO()` to a...

# arrow

[Xuc Xiem]

How to convert this list val eitherList: List<Either<Exception, String>> = TODO() to a List<String>? Someone on StackOverflow (I think) suggested:

eitherList
  .filterIsInstance<Either.Right<String>>()
  .fold(emptyList()) { acc, right -> right.fold({ acc }, { acc + it }) }

Is there any better way?

[Tesserakt]

This should work:

eitherList.filterMap { it.toOption() }

Use suitable overload of toOption to not get Option<Either<..., ...>> 😄