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ToRightDisjunction in cats

I have not found a function like toRightDisjunction

in scalaz

to convert Option

to Either

. Why cats

doesn't it provide such a function?

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1 answer


The scala library provides these functions via Option.toLeft

and Option.toRight

:

val s = "Oh no".some
val leftRes: Either[String, Int] = s.toLeft(42)
val rightRes: Either[Int, String] = s.toRight(42)


Since it Either[A, B]

became defacto standard in 2.12 (replacing Xor

) after the correct offset, there is no need for any additional extension methods.

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