From: Jonathan Rochkind <rochkind@...>
Date: 2009-06-17T06:42:48+09:00
Subject: Re: list methods only for specific class

Steve Ross wrote:

> Often, I'm most interested in methods unique to a given class and not
> those inherited from, say, Object:
> 
> (Array.instance_methods - Array.private_instance_methods -
> Object.public_methods).sort
> 
> And I sort them for easier reference. Don't know if this adds any
> information...

If you really want unique to the class, and the class may have a more 
complex object hieararchy than just inheriting from Object, why not 
something like:

(MyClass.methods - MyClass.superclass.methods)

I _think_ that'll work, although how included modules in MyClass are 
treated should be tested experimentally. I think it'll still work cause 
of the magic anonymous singleton class thing ruby uses for module 
mix-ins and such.

The trick in both Steve's and my attempt is the really useful '-' 
operator/method on Arrays, which does array difference. So useful! See 
also '&' for array intersection. Can save you a lot of hacky code if you 
remember they're there.

Jonathan
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