From: Xavier Noria <fxn@...>
Date: 2007-04-30T18:13:39+09:00
Subject: Re: cyclic array

On Apr 30, 2007, at 3:43 AM, Rick DeNatale wrote:

> On 4/28/07, Xavier Noria <fxn@hashref.com> wrote:
>
>>
>> This is a possible approach:
>>
>>    module Enumerable
>>      def each_cycle(window, start=0)
>>        (start...length+start).each do |i|
>>          yield((i..i+window).map {|n| self[n % length]})
>>        end
>>      end
>>    end
>
> This method won't work for Enumerables in general, although I guess it
> does work for Arrays.
>
> Not all enumerables have one or both length or [] methods.

Oh right, thank you. I don't know why ri Enumerable lists length  
here, looks like it is getting non-core methods from somewhere else.  
I overlooked [] though. The OP wanted this for an Array, it would  
certainly work there.

-- fxn