Hi :wave:. I'm trying to use `Validated` instead `...

# arrow

[Srki Rakic]

Hi 👋. I'm trying to use Validated instead require for validation when constructing an object.

class Probability private constructor(val value: Double) {
  companion object {
    fun create(value: Double) =
      if (value > 0.00 && value < 1.00) Probability(value).valid()
      else ValidationError.ProbabilityOutOfBounds("Probability must be between 0.00 and 1.00").invalid()
  }
}

I'm struggling to find the best way to structure it in a given context. Typical use case for `Probability`:

val fsmIdentifiers =
  listOf(
    FsmIdentifier(
      key = "first",
      mProbability = Probability(0.95),
      uProbability = Probability(0.1),
      compare = ::jaroWinklerDistance
    ),
    FsmIdentifier(
      key = "last",
      mProbability = Probability(0.99),
      uProbability = Probability(0.01),
      compare = ::jaroWinklerDistance
    ),
    FsmIdentifier(
      key = "middle",
      mProbability = Probability(0.90),
      uProbability = Probability(0.1),
      compare = ::jaroWinklerDistance
    ),
......
)

As you see, the Probability is created as part of the FsmIdentifier (and other similar identifiers). Any suggestion on how to handle the creation with Validated in this context cleanly, without making the code look overwhelmingly verbose?

[stojan]

here is an example of how to combine validation of smaller object to build bigger objects:

https://github.com/LordRaydenMK/BirthdayKata/blob/c2eee0ee3012467b7619d126137a96a4a716d580/src/main/kotlin/com/sanastasov/birthdaykata/Model.kt

[Srki Rakic]

Great. Thank you!