多次元Hash

2次元

h = Hash.new{|hash, key| hash[key] = {} }
h["app"]["a"] = 10
p h["app"]["a"]

10

3次元

h = Hash.new{|hash, key| hash[key] = Hash.new{|hash, key| hash[key]={}} }
h["app"]["a"]["b"] = 10
p h["app"]["a"]["b"]

10

reference

• http://rakkyoo.net/?p=607