From: Phlip <phlip2005@...>
Date: 2009-03-09T10:48:19+09:00
Subject: Where's the best version of Hash#pass and Hash#block?

Rubies:

This snippet shows how to pass or block arbitrary subsets of Hashes, by their keys:

   http://snippets.dzone.com/posts/show/2178

Those items seem useful, because Hashes are not as set-theoretic as Arrays. I 
suspect, for example, one cannot & two Hashes to extract their intersection.

That post is from 2006 - essentially the Neolithic Era!

Where's the best modern version of those methods?

-- 
   Phlip