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import scala.annotation.tailrec
import scala.util.Random

/**
  * Created by levkovich.n on 20/07/2016.
  */
object WhileLoop extends App {

  var r = 0
  val value = run {
    r = Random.nextInt(10)
    r
  } until (r == 0)
  println(value)

  @tailrec
  def whileLoop(condition: => Boolean)(command: => Unit): Unit = {
    if (condition) {
      (command);
      whileLoop(condition) {
        command
      }
    }
  }

  val array = Array(1, 2, 3)
  var i = 0
  whileLoop(i < array.length) {
    println(i)
    i += 1
  }
}

class run[A](body: => A) {
  @tailrec
  final def until(condition: => Boolean): A = {
    val ans: A = body
    if (!condition) until(condition) else ans
  }
}

object run {
  def apply[A](body: => A): run[A] = new run(body)
}