> -----Original Message-----
> From: Derek Wyatt [mailto:derek / derekwyatt.org] 
> Sent: Friday, August 19, 2005 10:57 AM
> To: ruby-talk ML
> Subject: Re: Newbie:Differences between arrays
> 
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> You want:
> 
> ~  added_users = NEW - OLD
> 
> Regs,
> D

For set operations you'll probably want to use the "set" package.  Part
of the stdlib.

See ruby-talk:65361 for potential gotchas wrt Array diff vs Set diff.

Regards,

Dan