Scala Future with predicate in for comprehension

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    Jose Romero

    comprehensionpredicatefuture•••

    Idiomatic solution to have filter, conditionals, predicates in Futures' for-comprehension

    Example of usage:

    val f2 = for {
      i <- f1
      _ <- predicate( i == 2 )(new Exception("Test2"))
      j <- f3  // f3 will only run if the predicate is true
    } yield "Test1"
    
    import scala.concurrent.Future
    
    def predicate(condition: Boolean)(fail: Exception): Future[Unit] = 
        if (condition) Future( () ) else Future.failed(fail)
    
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