From: Jesse Edelstein <jmedelstein@...>
Date: 2007-11-22T02:04:24+09:00
Subject: Re: is there an nicer way for this expression?

On Nov 21, 2007 10:35 AM, Wayne Magor <wemagor@hotmail.com> wrote:
> Not a stupid question at all.  Many people want this in Ruby!
>
> Here's the solution (which should be standard in Ruby):
>
> class Object
>   def in?(an_array)
>     an_array.include?(self)
>   end
> end
>
>
> Then, your desire to have something like (foo.bar=1,2) would become:
>
> foo.bar.in?([1,2])
>

Yeah, The Ruby Way also says that this should be part of the language.
But I'm not sure it makes sense from an OO perspective - being "in" a
container (or having a copy of oneself in that container) is not a
property of an object, but rather a property of the container. It's
convenient, but seems logically backwards.