From: Robert Klemme <shortcutter@...>
Date: 2008-12-18T04:02:50+09:00
Subject: Re: function discovery

On 17.12.2008 18:24, Phlip wrote:
>  > [Note:  parts of this message were removed to make it a legal post.]
> 
> I express no curiosity about the illegal parts! (-;
> 
> Joshua Ball wrote:
> 
>> I am curious if there is a programatic way to list all methods of a 
>> class.
>> (Yes, I know about "ri", I am just curious here)
> 
> ri only returns what the documentor felt like telling you.
> 
> Here's my favorite wrapper on the 'public_methods' system:
> 
>   def what?(anObject)
>     p anObject.class.name
>     puts (anObject.public_methods - Object.new.public_methods).sort
>   end

You do not need to construct an instance of Object - you can as well use 
Object.public_instance_methods.

> Now you just say 'what? f', and it tells you what f's all about. It also 
> throws away all the stuff f inherited from Object, because you should 
> already know it!

Here's an alternative version, which prints methods with the defining 
class.  Note that this omits methods defined at the instance level.

def what? o
   o.class.ancestors.each do |cl|
     p cl, cl.public_instance_methods(false).sort
   end
end

Kind regards

	robert