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 <stevewi...@gmail.com> > That's the Null Object Pattern! > > http://en.wikipedia.org/wiki/Null_Object_pattern > > > 2009/6/4 Hernan Wilkinson <hernan.wilkin...@gmail.com> > > 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 <m.rue...@acm.org> 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 >>> >>> _______________________________________________ >>> Pharo-project mailing list >>> Pharo-project@lists.gforge.inria.fr >>> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project >>> >> >> >> _______________________________________________ >> Pharo-project mailing list >> Pharo-project@lists.gforge.inria.fr >> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project >> > > > _______________________________________________ > Pharo-project mailing list > Pharo-project@lists.gforge.inria.fr > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project >
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