From: Michel Demazure <michel@...>
Date: 2010-10-11T20:42:19+09:00
Subject: Re: Testing for subarrays

David A. Black wrote:

> Here's another way that is more verbose but that doesn't create the
> whole array (which probably doesn't matter anyway, unless it's a huge
> array and you're cycle-shaving). I also prefer extending individual
> objects, rather than adding to Array.
> 
> module SubArrayFinder
>    def look_up(sub_array)
>      sub_size = sub_array.size
>      index = find_index.with_index do |e,i|
>        self[i, sub_size] == sub_array
>      end
>      return(index..index+sub_size-1) if index
>    end
> end

Comparing with my original proposal, a side question is whether using 
each_cons is faster, or not, that iterating with self[i, sub_size]...

_md
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