How to name parameters for a function in a method signature in scala?

Question

def downloadResultsPage(onPageDownload: (List[String], Boolean) => Unit) {
    body here...
}

In this example onPageDownload is the closure that will be called when the page is completed. To make the code self-document better, I'd really like to be able to have something like this:

(onPageDownload: (results: List[String], finished: Boolean) => Unit)

Is there a way to do this?

Thanks!

write CaseClass => Unit where CaseClass is case class CaseClass(results: List[String], finished: Boolean) — kiritsuku
– kiritsuku, Commented Aug 11, 2014 at 12:43

wedens · Accepted Answer · 2014-08-11 06:00:23Z

2

you can create type alias like type DownloadCompletedHook = (List[String], Boolean) => Unit or you can create trait and then implicitly convert if you wish your functions to this trait:

trait DownloadCompletedHook extends ((List[String], Boolean) => Unit) {
  def apply(results: List[String], finished: Boolean): Unit
}

implicit def funToTrait(f: (List[String], Boolean) => Unit): DownloadCompletedHook = new DownloadCompletedHook {
  def apply(results: List[String], finished: Boolean): Unit = f(results, finished)
}

and more simple way (but less semantic i think) is to group results: List[String], finished: Boolean into case class

edited Aug 11, 2014 at 6:00

answered Aug 11, 2014 at 5:17

wedens

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