From: Jeremy Henty <jeremy@...>
Date: 2006-10-06T23:30:20+09:00
Subject: Re: nil being empty

On 2006-10-06, David Chelimsky <dchelimsky@gmail.com> wrote:

> ... in a case like this:
>
> collection.select do |item|
>   item.respond_to?(:empty?) and (!item.empty?)
> end

If the issue is simply that the collection might contain nils (rather
than some more general empty? things) I would just write

    collection.compact.select do |item|
      ...
    end

or 

    collection.compact.select do |item|
      item && ...
    end

Those examples only deal with a special case, but I've never needed to
implement anything more general.  YMMV

Regards, 

Jeremy Henty