From: Sam Roberts <sroberts@...>
Date: 2004-03-18T08:10:54+09:00
Subject: Re: Can subclass have superclass method return instance of subclass

Quoteing cjh-nospam@nospaManagesoft.com, on Thu, Mar 18, 2004 at 07:20:54AM +0900:
> walter@mwsewall.com wrote:
> >Ruby has such beautiful Array functionality that I find I always end 
> >up wanting to use it in my customized subclasses.
> 
> Can't you get much of what you want my mixing-in Enumerable?

Array has lots of useful apis that Enumerable doesn't. I suspect,
though, that you could define a core set of "Array" operations, and
then write an Arrayable module that when you mix-in, gives you all the
other Array methods (&, *, slice, ...) that Enumerable doesn't have.

Maybe you could even write Arrayable so it is entirely implemented with
each(), but I think it wouldn't be very efficient, imagine having to
implment [] by doing each_with_index() until you found the required
index!

Cheers,
Sam