#!/usr/bin/env ruby
# This code comes from http://ruby-it.org/pages/Hash+Infinito
# Check the page for copyright notice and explanations



 >> superhash['primo']= "alore"
 => "alore"
 >> superhash['due']['livelli']
 => {}
 >> superhash['due']['livelli']= 'ciao'
 => "ciao"
 >> superhash
 => {"primo"=>"alore", "due"=>{"livelli"=>"ciao"}}
 >> superhash[:tutti][:i]['livelli']['che']["desiderate"]= "bau"
 => "bau"
 >> superhash
 => {"primo"=>"alore","due"=>{"livelli"=>"ciao"},
      :tutti=>{:i=>{"livelli"=>{"che"=>{"desiderate"=>"bau"}}}}}

 >> hash_maker = proc do |h, k|
 ?>    h[k] = Hash.new(&hash_maker)
 >> end
 => #<Proc:0x027d1520@(irb):1>
 >> sala=Hash.new &hash_maker
 => {}

 >> sala[0][1]='signor rossi'
 => "signor rossi"
 >> sala[2][20]='signora bianchi'
 => "signora bianchi"
 >> sala[5][12]='signor mori'
 => "signor mori"
 >> sala.size
 => 3

 >> x=0
 => 0
 >> ary=Array.new(10) { x+=1 }
 => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

 >> hsh=Hash.new {|hash,kiave| hash[kiave]=x+=1  }
 => {}
 >> hsh[:a]
 => 11
 >> hsh[:s]
 => 12
 >> hsh[29]
 => 13