Result Labels

Carry success or error as a labeled result.

ResultLabels.scala

object Main {
  def main(args: Array[String]): Unit = {
    val divisor = 
    val ok = divisor != 0
    val value = if (ok) 100 / divisor else 0
    val outcome = if (ok) "ok:" + value else "error:divide-by-zero"

    println("ok=" + ok)
    println("outcome=" + outcome)
  }
}

object Main {
  def main(args: Array[String]): Unit = {
    val divisor = 
    val ok = divisor != 0
    val value = if (ok) 100 / divisor else 0
    val outcome = if (ok) "ok:" + value else "error:divide-by-zero"

    println("ok=" + ok)
    println("outcome=" + outcome)
  }
}

object Main {
  def main(args: Array[String]): Unit = {
    val divisor = 
    val ok = divisor != 0
    val value = if (ok) 100 / divisor else 0
    val outcome = if (ok) "ok:" + value else "error:divide-by-zero"

    println("ok=" + ok)
    println("outcome=" + outcome)
  }
}

result-labels A result can be modeled as a success or error label with a value. This guards a risky step, like division, without an exception.