what's the most efficient path from `Either<Either<L, R>, R>` to `Either<L, R>`?

# arrow

[Tom Davis]

what's the most efficient path from Either<Either<L, R>, R> to Either<L, R>?

[Alejandro Serrano.Mena]

the most efficient would definitelye be some sort of when

when {
  x is Either.Right -> x
  x is Either.Left -> x.value
}

[Alejandro Serrano.Mena]

you could also do x.recover { it.bind() }

[Łukasz Gendek]

x.flatten()

[Łukasz Gendek]

but I can see that flatten is not the inline method, so probably it is not as efficient as recover

[simon.vergauwen]

flatten, is only for right side so Either<L, Either<L, R>> but there could of course also be flattenLeft() but it's a very uncommon operator afaik.

[Łukasz Gendek]

Now I see

[Tom Davis]

thanks, very helpful! 🙏