On Nov 8, 2011, at 13:48 , Cassna Capriet wrote:

> You have to declare your variable in this way:
> 
> a  = Hash.new{|h, k| h[k] = Hash.new(&h.default_proc)}

I prefer a more readable approach:

class NestedHash < Hash
  def initialize
    super { |h,k| h[k] = NestedHash.new }
  end
end

a = NestedHash.new