From: Rupert Voelcker <rupert@...>
Date: 2008-12-16T18:12:31+09:00
Subject: Re: Unique values in hash?

> I have a hash that contains duplicate data, for example, :username =>
> "alex" comes many times.
> I want to loop around and print their names just once (only unique). In
> simple loop it would print "alex" repeatedly.

hash.map { |k,v| v }.uniq.each { |name| puts name }

should do it

Rupert