Grasping the concept of Classes & Categories
Daniel Salama
dsalama at user.net
Thu Jun 16 16:52:41 UTC 2005
Hello all,
I've been playing with Squeak for some time and have a question. if I
wanted to use a Squeak instance to serve different applications (say
multiple applications using Seaside), how unique do classes need to
be? Sorry for the vague question. Let me be more specific.
I have two applications that both need a class Customer. However, one
of the application requires that class Customer have a set of
attributes and methods very different from the second application who
uses the class Customer for a totally different industry.
If I create a category for each of the applications, can I have a
class Customer for Category A and another class Customer for Category B?
In a way, I think I'm going to try to answer the question myself, but
would prefer to get clarification or validation from you guys, who
are much more experienced than me. The Smalltalk way would be to
reuse code as much as possible. Therefore, I should probably
carefully design a class Customer so that it may be sub-classed into
more specialized classes such as IndustryACustomer and
IndustryBCustomer. Is this the Smalltalk mentality? Coming from other
environments which don't "encourage" you to work efficiently may be
what's confusing me.
Thanks,
Daniel
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