From: Andy Cooper <acooper@...>
Date: 2009-01-14T07:18:55+09:00
Subject: Re: Returning a duplicate from an Array

> > Hey guys,
> >  I have an array of names that may contain duplicates. What I 
> > would like
> > to do is return an array OF THE DUPLICATES. I was looking around at
> > various built-in methods for arrays, but the closest thing I 
> > can find is
> > Array.uniq, which returns the array without the duplicates.
> > 
> > Any suggestions on how to do this?
> > 
> > Thanks,
> >  - Jeff Miller
> > -- 
> 
> Without really looking into it a quick and dirty way would be to just
> subtract the results of .uniq from the initial array.
> 
> Andy Cooper.

Nevermind that wont work afterall, wasn't thinking about how arrays work
at the time.

  def dups(ary=[])
    uniq=ary.uniq
    ary.reject{|z| if(uniq.include?(z));q-=[z];true;end}
  end

There that should do the trick.  Still very probably not the best of
ways to do it though.

Andy Cooper.