From: Ray Pereda <raypereda@...>
Date: 2008-08-15T06:15:40+09:00
Subject: tricky hash initialization

h = Hash.new {|h,k| h[k] = {} }

This is one level deep defaults to a fresh new hash.

h = Hash.new {|h,k| h[k] = Hash.new{ |h2,k2| h2[k2] = {} } }

This is two levels deep initialization to a fresh new hash.

How do I this for arbitrarily deep hashes?

h["a"]["b"]["c"] = 3  #=> {"c"=>3}

I'm using this to build very clean implementations of state machine
building algorithms.

Your help is very much appreciated.

-Ray
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