Deep create child hashes

array.rb

class Hash
  #   k = {}
  #   k.create_deeps(*%w(1 2 3 4 5 6 7 8 9 10))
  #   #=> {"1"=>{"2"=>{"3"=>{"4"=>{"5"=>{"6"=>{"7"=>{"8"=>{"9"=>"10"}}}}}}}}}
  def create_deeps(*args)
    self.replace deep_create(*args)
  end
  
  def deep_create(*args)
    dup.deep_create!(*args)
  end
  
  def deep_create!(*args)
    if args.length > 2 && self[k=args.shift].nil?
      self[k] = deep_create(*args)
    else
      self[args.shift] = args.pop
    end
    self
  end
end