Explanation needed

[LNUitTutor]

Classes in a part of chapters (e.g. chapter 6, 7, 9) use symbols in the defaultLayout method on instance side. In contrast to this, classes in another part (e.g. chapter 2, 3, 11) use instance variables. So, it has to be clarified:

• which way is better?
• which way is preferred?
• is the using of symbols a former tradition (from a class side method)?

[koendehondt]

Thank you for the feedback. You are right. It has to be clarified. We will keep this ticket for when we update the book to Pharo 13.