Conditional operators "? :"

Hi there!
I just ran into this little problem which is pretty superficial, but i simply dont know the answer to it.
I want to replace several simple ‘if’ statements with conditional operators (? : ), but there is no ELSE statement.
Right now i have a solution as defined below, but it’s pretty ugly…
Is there a standard way to define this?

public function addDays(daysAdded:Number):DateDeluxe
    {
        /*
        if ( daysAdded == undefined )
        {
            daysAdded = 0;
            }
        */
        
        daysAdded = (daysAdded == undefined) ? 0:daysAdded;
etc...

I was thinking more about something like this:

daysAdded = (daysAdded == undefined) ? 0;

But it seems that this isnt valid code.

Greets and eternal infamy for those that can help me :wink:
Flashkiddy!