[Cuis-dev] smalltalk newbie - Complex

[Juan Vuletich]

Hi Jon,

Yes, you're right. If Object needs to be aware of everything it is not, 
then it needs to be aware of everything that could possibly exist. Of 
course, that doesn't scale. #is: means 'if I don't even have a clue what 
you're asking for, then I'm not one of those'! In practical terms it 
means to avoid the need of everyone adding stuff to Object.

Cheers,

On 28/09/2025 9:11 AM, Jon Raiford via Cuis-dev wrote:
> I didn't notice anyone else pointing this out... Have a look at how 
> many "is" methods are defined on Object in Cuis. Although it is a very 
> common pattern in Smalltalk, in Cuis this was changed slightly. Yes, 
> there are some common is methods like isString (and isComplex), but 
> there is also the #is: method. The idea is to only implement #is: on 
> your classes that should answer true. Have a look at implementors and 
> senders to understand how it's implemented and used. I believe the 
> purpose of this is to help prevent packages from adding methods to 
> Object unnecessarily.
>
> Jon
>
> *From: *Cuis-dev <cuis-dev-bounces at lists.cuis.st> on behalf of 
> Jonathan Kelly via Cuis-dev <cuis-dev at lists.cuis.st>
> *Date: *Friday, September 26, 2025 at 8:31 PM
> *To: *cuis-dev at lists.cuis.st <cuis-dev at lists.cuis.st>
> *Cc: *Jonathan Kelly <jonkelly at fastmail.fm>
> *Subject: *[Cuis-dev] smalltalk newbie - Complex
>
> Hi,
>
> I'm playing with Cuis smalltalk, and building a Complex class, so far so
> good. But I want to add an  "isComplex" method on Object, and
> an  "asComplex" method on Number, but I can't find a way to tell Cuis
> that the new methods belongs to the Complex package.How do I make all my
> changes belong to the Specific package they're related to?
>
> Thanks
>
> Jon
>
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>
-- 
Juan Vuletich
www.cuis.st
github.com/jvuletich
researchgate.net/profile/Juan-Vuletich
independent.academia.edu/JuanVuletich
patents.justia.com/inventor/juan-manuel-vuletich
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