Back to the Title Helper

We are now in a position to understand the full_title helper from Listing 4.2:5

     These elements—function definition, variable assignment, boolean tests, control flow, and string interpolation—come together to make a compact helper method for use in our site layout. The final element is module ApplicationHelper: Modules give us a way to package together related methods, which can then be mixed in to Ruby classes using include. When writing ordinary Ruby, you often write modules and include them explicitly yourself, but in the case of a helper module Rails handles the inclusion for us. The result is that the full_title method is automagically available in all our views.