Ordered Guards

Check ordered conditions from general to specific.

NestedGuards.scala

object Main {
  def main(args: Array[String]): Unit = {
    val score = 
    var result = "retry"

    if (score >= 60) {
      result = "pass"
    }
    if (score >= 90) {
      result = "honor"
    }

    println("score=" + score)
    println("result=" + result)
  }
}

object Main {
  def main(args: Array[String]): Unit = {
    val score = 
    var result = "retry"

    if (score >= 60) {
      result = "pass"
    }
    if (score >= 90) {
      result = "honor"
    }

    println("score=" + score)
    println("result=" + result)
  }
}

object Main {
  def main(args: Array[String]): Unit = {
    val score = 
    var result = "retry"

    if (score >= 60) {
      result = "pass"
    }
    if (score >= 90) {
      result = "honor"
    }

    println("score=" + score)
    println("result=" + result)
  }
}

ordered-guards Ordered guards let later checks refine an earlier result when the conditions are simple and explicit.