From: Douglas Livingstone <rampant@...>
Date: 2006-05-23T05:55:29+09:00
Subject: Re: Creating Hash of Arrays

2006/5/22, Paul D. Kraus <paul.kraus@gmail.com>:
> >
> >
> > h = Hash.new { |hash, key| hash[key] = Array.new }
>
>
> Newbie here but what exactly does this like do.
> Can you someone break it down for me thanks.
>

From the docs: http://www.ruby-doc.org/core/classes/Hash.html#M000886

If you try and get the value using a hash key which does not exist,
then the value of the block when called with the hash and the new key
will be returned instead.

Douglas