From: Giles Bowkett <gilesb@...>
Date: 2006-11-25T04:47:50+09:00
Subject: Re: how do I contribute to Ruby?

> Well, unlike a lot of languages, in Ruby you can modify all sorts of
> built-ins.    I don't personally believe that a case such as this
> warrants it though, and often in Ruby it's better to use respond_to?
> (duck typing) depending on the situation of course.
>
> class Array
>     def is_an?(klass)
>         return is_a?(klass)
>     end
> end
>
> [].is_an? Array      #=> true

Just as an aside, to implement this, I would much rather monkeypatch
Object than Array. Otherwise it just happens again the next time I
have a class which begins with a vowel.

-- 
Giles Bowkett
http://www.gilesgoatboy.org