an odd bug

> yes, but not only that... I also create "complete objects"  from its  
> very first time. For example, instead of:
> Date new day:1; moth:1; year: 2009.
> I do:
> Date newDay: 1 moth: 1 year: 2009.
>
> That way you will never have an invalid Date
>
> 2009/6/4 Steve Wirts <[hidden email]>
> That's the Null Object Pattern!
>
> http://en.wikipedia.org/wiki/Null_Object_pattern
>
>
> 2009/6/4 Hernan Wilkinson <[hidden email]>
>
> I was going to suggest exactly that.
> As a rule, I never use nil because if you do it you will have to  
> check for it somewhere... nil is the root of most of the problems!  
> if not, look at all the errors I fixed in the other mail, most of  
> them are because nil is being used.
> So, instead of nil, another object has to be use, and like you said  
> in this case an empty collection I think will work. I'm just  
> changing that... I'll send the changes today (I hope).
>
> Hernan.
>
>
> On Thu, Jun 4, 2009 at 11:32 AM, Michael Rueger <[hidden email]>  
> wrote:
> Sean Allen wrote:
>
> > Just as a bit more info. I used squeak for several months without  
> ever
> > seeing this error.
> > I used pharo for 3 months without seeing this error. I've only  
> gotten
> > this error in the latest images
> > with the latest vm and get it constantly. Not occassionally, I can  
> get
> > this to happen at least
> > once every 120 seconds or so, sometimes more often. It would seem  
> to be
> > as an outsider,
> > that something must have changed.
>
> it definitely sounds like it.
> Would be good to investigate what might have changed in the call path
> that *sets* the variable to check why it is ending up being nil. Maybe
> it shouldn't be set or initialized to nil but to an empty collection  
> in
> those cases?
>
> Michael
>
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