kotlin-stdlib/com.javiersc.kotlin.stdlib/Either/getOrNull

getOrNull

Returns the unwrapped value B of Either.Right or null if it is Either.Left.

import arrow.core.Either
import io.kotest.matchers.shouldBe

fun test() {
  Either.Right(12).getOrNull() shouldBe 12
  Either.Left(12).getOrNull() shouldBe null
}