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kotlinarrow-kt

How to map 2 Either values without tupled

I need to take 2 values, each of them is Either<Throwable, Any> and combine them together (or to do anything else) if each of the values is Right.

For arrow-kt 0.11.0 it was possible with tupled

tupled(
     "Hello".right(), 
     "Word".right()
).map { params ->
     println(params.a + params.b) //go to map ONLY IF a and b are always right
}

but since arrow-kt 0.12 tupled is deprecated in favor of Kotlin's Pair and Triple and I cant figure out how to achieve the same without tupled`.

Solution

  • You can use Either.zip

    "hello".right().zip("world".right()) { a, b -> a + b }