Hey Ferdinand,
Here are a couple of examples:
import _root_.net.liftweb.common._
val boxExample: Box[Int] => Int = {
case Full(x) => x
case Empty => 0
}
def boxExample2(boxedInt: Box[Int]): Int = {
boxedInt.map({i =>
i
}) openOr 0
}
On Nov 12, 12:28 am, Naftoli Gugenheim <[email protected]> wrote:
> What do you want to happen if you call "value" on an Empty?
>
> -------------------------------------
>
> Ferdinand Chan<[email protected]> wrote:
>
> Wondering what's the normal practice of using a Box. As a Java
> developer, I always want to get the boxed value by a method named
> "Value" like
>
> val optionalContent = Full("This is optional")
>
> Log.info( " The optional content is " + optionalContent.value)
>
> But I know its not a valid way to do so in lift ( same for Option in
> Scala)
>
> From the book programming in Scala , there's an example
>
> val withDefault: Option[Int] => Int = {
> case Some(x) => x
> case None => 0
>
> }
>
> which suggest the use of match to retrieve the value of the boxed
> content. It make sense to me and I'm totally agree with the advantage
> of using match + option (Box) combination.
>
> However, as a newbie to Scala, I'm so tempted to use something
> like .Value to retrieve the box value .
>
> So, what's the normal way to use Box ?? Could someone kindly provide
> some example on how to use ? I tried to look through some source code
> of Lift but its not easy for a newbie :)
>
> Thanks
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