From: Michael Campbell <michael.campbell@...>
Date: 2005-08-04T04:21:05+09:00
Subject: Re: Cascading <=> comparisons

"Robert Klemme" <bob.news@gmx.net> writes:

> David A. Black <dblack@wobblini.net> wrote:
> > Hi --
> >
> > On Sat, 16 Jul 2005, Robert Klemme wrote:
> >
> >> This technique can be applied to sort_by, too:
> >>
> >>>> hash.sort_by {|a| a.reverse}
> >> => [["a", 1], ["d", 1], ["c", 3], ["b", 4]]
> >>
> >> But this shows a strange anomaly - this seems like a bug in 1.8.2.
> >>
> >>>> hash.sort_by {|a| a.reverse!}
> >> => [[1, "a"], [1, "d"], [3, "c"], [4, "b"]]
> >
> > I'll probably figure this out as soon as I hit 'send'... but what's
> > the anomaly here?
> 
> And, did you figure in the meantime? It's the different result -
> IMHO anything that sort_by does should have no such effect on the
> result.

Even if the operation is a "bang" one?  


-- 
I tend to view "truly flexible" by another term: "Make everything
equally hard". -- DHH