From: rcoder <rcoder@...>
Date: 2005-08-20T03:01:16+09:00
Subject: Re: Newbie:Differences between arrays

You probably want something like this:

---
require 'set'

OLD = Set.new(%w{ someone admin blah })
NEW = Set.new(%w{ admin blah newacct })

(OLD - NEW).each { |user|
  # these users were removed...
}

(NEW - OLD).each { |user|
  # and these have been added...
}
---

-Lennon