kek.scala

object hello extends App {
  import scala.concurrent.ExecutionContext.Implicits.global
  val f1: Future[Int] =Future.failed(new Exception("hello i m exc"))
  val f2: Future[Int] = Future.successful(13)

  val res = for {
    f11 <- f1
    f22 <- f2
  } yield f11 + f22


  res.onComplete{
    h=>
      if(h.isSuccess){
        println(h.get)
      }
      else {
        println("failed")
      }
  }

  Thread.sleep(1000)
}