From: Brian Katzung <lists@...>
Date: 2013-07-31T02:58:40+09:00
Subject: Re: nested hash from array of paths

Alternatively:

require 'xkeys'
array = ["home", "about", "about/history", "about/company",
"about/history/part1", "about/history/part2"]
tree = {}.extend XKeys::Hash
array.each { |path| tree[*(path.split ?/)] = nil }
p tree
# {"home"=>nil, "about"=>{"history"=>{"part1"=>nil, "part2"=>nil},
# "company"=>nil}}

The leaves are nil (not empty hashes), and the code is slightly less 
convoluted.

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