nested dictionary searching

gistfile1.txt

dict = {}
'aardvark'.chars.inject(dict) { |dict,c| dict[c] = {} }

def find(key, dict)
  current_dict = dict
  key.chars.each do |c|
    return nil unless current_dict.has_key?(c)
    current_dict = current_dict[c]
  end
end

puts 'Found key' if find('aardvark', dict)