create custom html helpers in ruby on rails

To create a new helper:

1. choose a name for the helper file, for instance tags_helper.rb
2. create the file in the /app/helpers directory

3. create a module according to the file name. In this case

   module TagsHelper
   end
   

4. define your helper as method

   module TagsHelper
     def hello_world(name)
       "hello #{name}"
     end
   end
   

Now you can use the hello_world helper method in your view.