From: Farrel Lifson <farrel.lifson@...>
Date: 2007-05-25T19:34:59+09:00
Subject: Re: Replacement idiom for "list_or_nil.to_a"?

On 25/05/07, Rich Morin <rdm@cfcl.com> wrote:
> I suppose I could define my own to_a method for nil,
> but that seems a bit questionable, as well.  So, is
> there a Better Way To Do It?

If you're going to get a list or nil then I find it nice to wrap it in
the Kernel#Array() method. It will convert a nil to a an empty array
but will leave an array untouched:

irb(main):001:0> Array(nil)
=> []
irb(main):002:0> Array([1,2,3])
=> [1, 2, 3]

Farrel