From: Matthew Harris <shugotenshi@...>
Date: 2006-06-15T20:57:55+09:00
Subject: Re: Does each over an array bring a counter/index with it?

Ruby's Comparable module vs. Java's Comparable interface.

Ruby: (http://ruby-doc.org/core/classes/Comparable.html)
Java: (http://java.sun.com/j2se/1.3/docs/api/java/lang/Comparable.html)

Notice the `compareTo()' method in Java's Comparable is equivalent to
the `<=>' method which Ruby's Comparable module requires to be
defined.

This is how interfaces and mix-ins work.

Ruby's mix-ins are closer to interfaces than they are inheritance.
Inheritence implies subclassing, most of the time.

On 6/15/06, Dick Davies <rasputnik@gmail.com> wrote:
> On 15/06/06, Matthew Harris <shugotenshi@gmail.com> wrote:
> > > No, it's a mixin (a bit like OOP inheritance in other languages).
> >
> > You mean a bit like interfaces.
>
> Not really. Interfaces don't specify an implementation.

-- 
Matt