From: Daniel Schierbeck <daniel.schierbeck@...>
Date: 2006-07-28T02:45:06+09:00
Subject: Re: rand(-10..10)

ChrisH wrote:
> 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

I think sorting the entire enumerable may be slight overkill, although 
it of course is prettier :)


Daniel