gistfile1.rbx

class String
  def title_case!
    self.split.map{ |w| w.capitalize }.join(' ')
  end
end


class Hash  
  def title_case_keys!
    self.each_pair do |k,v|
      self[k.title_case!] = v 
      self.delete k
    end
  end
end

countries = {"UNITED STATES" => "USA" , "UNITED KINGDOM" => "UK"}.title_case_keys!
p countries