From: Intransition <transfire@...>
Date: 2010-04-10T03:53:28+09:00
Subject: Re: Is it possible, a fully general Enumerable#recursive ?



On Apr 9, 2:03 pm, Robert Dober <robert.do...@gmail.com> wrote:
> On Thu, Apr 8, 2010 at 5:51 AM, David Masover <ni...@slaphack.com> wrote:
> > On Wednesday 07 April 2010 04:49:15 pm Intransition wrote:
> <snip>
>
> >> This works for #each and #map but not #sort.
>
> > #sort isn't a method of Enumerable, it's a method of Array.
>
> ruby-1.9.1-p378 > Enumerable.instance_methods.grep /sort/
>  => [:sort, :sort_by]
> However you will need to define #<=>  on the return value of recursive.

Yep. That's trick b/c comparing and array or other enumerable to a non
enumerable raises an error. So sorting with this is probably out of
the question. On a side note, I am not so sure that raising an error
is best. Why not just assume that too non-comparable things are equal?