From: ChrisH <chris.hulan@...>
Date: 2006-07-28T01:25:04+09:00
Subject: Re: rand(-10..10)

Daniel Schierbeck wrote:
...
> This should work with all enumerables:
>
>    module Enumerable
>      def rand
>        entries = entries
>        entries.at(Kernel.rand(entries.length))
>      end
>    end
>
> I can't seem to get around the `entries = entries' part -- I don't want
> to convert the enumerable to an array more than once. Any ideas?

Enumerable supports sort_by, so could just use:

module Enumerable
  def rand
    self.sort_by{Kernel.rand}.last
  end
end

Cheers
Chris