On Mon, Jun 22, 2009 at 5:30 PM, Nolan Darilek <no...@thewordnerd.info>wrote:
>
> Wow, thanks for the quick response!
>
> On 06/22/2009 07:11 PM, David Pollak wrote:
> >
> > Try:
> >
> > val entries = Menu(Loc("Home", List("index"), "Home")) ::
> > Layout.menus ::: User.sitemap
> >
> >
> > Note the triple colon (:::) operator. This concatenates two lists.
> >
> >
> Hmm, so why wouldn't I need the ::: before Layout.menus as well? I'm
> assuming that's a list too, so why isn't list concatenation needed on
> that end?
scala> 1 :: List(2,3,4)
res1: List[Int] = List(1, 2, 3, 4)
scala> List(1,2,3) ::: List(4,5,6)
res2: List[Int] = List(1, 2, 3, 4, 5, 6)
scala> List(1,2,3) :: List(4,5,6)
res3: List[Any] = List(List(1, 2, 3), 4, 5, 6)
Because the thing to the Left of :: Layout.menus is a single item, not a
List of items. :: prepends a single item at the head of the List where :::
concats two Lists.
>
>
> >
>
--
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
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