From: Robert Klemme <bob.news@...>
Date: 2005-08-05T03:11:05+09:00
Subject: Re: Cascading <=> comparisons

Michael Campbell <michael.campbell@gmail.com> wrote:
> "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?

IMO yes.

    robert