RefactoringOptListFlatten

RefactoringOptListFlatten.scala

  object OptListFlatten {
    ///////////////
    val aList = List(Some(10), None, Some(20))
    for {
      x <- aList
      if (x.isDefined)
    } yield {
      x.get
    }
    //-------------
    for {
    	xOpt <- aList
    	x <- xOpt
    } yield x
    //-------------  
    aList filter (_.isDefined) map (_.get)
    //-------------  
    aList.flatten
    //-------------
  }