programming_languages_tight.rb

def reformat_languages(languages)
  result = {}
  languages.each_pair do |style, values|
    # style like :oo
    # values like {
    # :javascript => {
    #   :type => "interpreted"
    # }
    values.each_pair do |language, attributes|
      # language is like :javascript
      # attribute is like {
    #   :type => "interpreted"
    # }
    # case 1, i've never seen this language before
      result[language] ||= {}
      result[language][:type] = attributes[:type]
      result[language][:style] ||= []
      result[language][:style] << style
    end
  end
  result
end