You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: hash.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/mruby/mrbgems/mruby-hash-ext/mrblib
    
    the code of the file until where you have to start completion: class Hash

  # ISO does no
    
  def transform_values(&b)
    return to_enum :transform_values unless block_given?
    hash = {}
    self.keys.each do |k|
      hash[k] = yield(self[k])
    end
    hash
  end