From: "Bartosz Dziewoński" <matma.rex@...>
Date: 2011-11-05T04:00:10+09:00
Subject: Re: What happens in dual sorts with nil values?

I didn't test it, but it looks like a bad idea ;) So don't compare
nils. Just replace them with zeros or infinities (depending on whether
you want them to end up at the start or end of list), for example like
this:

    person.sort_by! { |a| [ a.last, a.first, a.age || 0 ]}

(Note that this will also replace false values with zeros.)


-- Matma Rex