Code snippets for the `value-based classes and error-handling` Medium article.

value-based-adt-example.kt

data class Password private constructor(val value: String) {
  companion object {
    fun of(value: String): Either<Violation, Password> {
      return when {
        value.isTooShort() -> Violation.PasswordTooShort(MIN_LENGTH).left()
        value.containsNoNumbers() -> Violation.PasswordContainsNoNumbers.left()
        else -> Password(value).right()
      }
    }
  }
	
  sealed class Violation {
    data class PasswordTooShort(val minLength: Int) : Violation()
    object PasswordContainsNoNumbers : Violation()
  }
}