[Newbies] Re: how to create an object (of a selection of classes)

[Jeroen van Hilst]

Benjamin,
{EllipseMorph. RectangleMorph} atRandom new.
Is a nice solution.

Thanky you for your very helpfull answer.
    - Jeroen

"Benjamin Schroeder" <benschroeder at acm.org> wrote in message
news:A9DC7832-6691-4DA5-A5A9-AB0501F96B64 at acm.org...
>
> On Jun 22, 2006, at 7:07 PM, Jeroen van Hilst wrote:
>
> > I've tried something like:
> >
> > (#(EllipseMorph RectangleMorph) at: (2 atRandom)) new.
> >
> > But thats too silly ? Is there some connection to get a class from
> > a symbol
> > ? Or is that the wrong direction ?
>
> I like your approach. I think using the #() array here will give you
> Symbols - but you can use a literal array with curly braces -
>
> {EllipseMorph. RectangleMorph}
>
> to get the actual classes. (Note the period between the array
> elements.) This form of literal evaluates its expressions and uses
> the results to build the array. it's also useful when you want to
> build an array out of some variables, or have some short math or
> something to do.
>
> Just to mention it, you can also get to a class from a Symbol by
> doing something like
>
> Smalltalk at: #EllipseMorph
>
> if that's needed in your situation.
>
> I don't know if you saw, but collections also respond to #atRandom
> directly, so you could do
>
> {EllipseMorph. RectangleMorph} atRandom new.
>
> Hope this helps,
> Benjamin Schroeder