class Hash

# File lib/hashconverter.rb, line 3
def stringify_keys
  h = self.map do |k,v|
    v_str = if v.instance_of? Hash
              v.stringify_keys
            else
              v
            end

    [k.to_s, v_str]
  end
  Hash[h]
end

# File lib/hashconverter.rb, line 17
def symbol_keys
  h = self.map do |k,v|
    v_sym = if v.instance_of? Hash
              v.symbol_keys
            else
              v
            end

    [k.to_sym, v_sym]
  end
  Hash[h]
end