[Newbies] Re: Defining a binary message selector
andy.burnett at knowinnovation.com
Sun Nov 15 22:19:38 UTC 2009
Michael said <<
why would the message have to be binary anyway? If you want the k-th
Fibonacci number, why don't you just send #fib to k?
Regarding symbols vs. not symbols: all selectors are symbols,
internally. I might get something in your e-mail wrong - could you
restate the question?
Thanks very much for your thoughts. Let me try to explain myself, slightly
First, this was just an experiment. I was reading a book on Python, saw how
they did it, and thought I would try in Squeak. So, I hadn't really thought
about how I was going to use it. I like your suggestion about implementing
is as: anInteger #fib. However, thinking about implementing it as a binary
message made me curious about why I couldn't do that.
The specific problem I am having is:
If I define an Integer method such as
Squeak is quite happy to let me create it. However, if I do something
like fib aNumber, the compiler complains that aNumber is a unknown
variable, which I need to define. So, what I was really trying to
understand was what it was about the e.g. <<< symbol which allowed it to
have an undeclared argument.
I think that, based on your last message, it is just that <<< etc have been
defined as special characters. Is that correct?
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