From: Eero Saynatkari <ruby-forum-reg@...>
Date: 2005-12-13T13:26:42+09:00
Subject: Re: About class methods

jonathan leonard wrote:
> Eero Saynatkari wrote:
>> Well, there is always define_method:
>> 
>>   # This code for illustrative purposes only. This is unadvisable.
>>   class Class
>>     def extend_by(method_name, &block)
>>       o = Object.const_set("#{self.name}Extension", Class.new(self))
>>       o.class_eval {
>>         define_method(method_name, &block)
>>       }
>>       o
>>     end
>>   end
>> 
>>   class Foo
>>   end
>> 
>>   Extension = Foo.extend_by('quux') { puts "Hello from quux!" }
>>   Extension.new.quux
> 
> Why is the code above unadvisable?

I personally think the idiom is a bit suspect but it could
just be I have not come across the need for it :) The above
merely illustrates that it is quite possible to do that in
ruby; however, another way might lead to a better design.

(Generally, any types of factories are simple in ruby and
the whole duck-typing thing helps, too.)

> --J


E

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