From: Bryan Richardson <btrichardson@...>
Date: 2008-08-07T08:05:52+09:00
Subject: Re: Need help detecting overlapping ranges

Crazy!  I had *just* discovered the r.last lastr.last max problem when 
you posted this.  Thanks! :)

David A. Black wrote:
> Here's the heavy artillery :-)
> 
> def merge_ranges(ranges)
>    ranges = ranges.sort_by {|r| r.first }
>    *outages = ranges.shift
>    ranges.each do |r|
>      lastr = outages[-1]
>      if lastr.last >= r.first - 1
>        outages[-1] = lastr.first..[r.last, lastr.last].max
>      else
>        outages.push(r)
>      end
>    end
>    outages
> end
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