From: Martin DeMello <martindemello@...>
Date: 2003-05-30T23:31:34+09:00
Subject: Re: Iteration - last detection

Paul Brannan <pbrannan@atdesk.com> wrote:
> 2) Both solutions have the problem of not being able to distinguish
>     between [] and [nil].

Also, "if prev yield prev" fails if there's a nil or a false in the
array. That's why you need (afaics) an explicit flag to say 'this is the
first iteration; prev has no value'. I tried leaving prev undefined and
rescuing NameError instead, but then the value doesn't persist beyond
the block.

martin