I finished the challenge on Chapter 18 which did not turn out to be too bad. Then I read through a "long" chapter 19 on Object Instance variables. Although the chapter itself was a little challenging, I found the challenge to be OK. At first I was a bit overwhelmed by the challenge but when I stopped and thought it through, I realized that I did not need to go to the extreme that the chapter did to get the right answer.
I actually like this chapter. It has a lot of interaction among multiple classes. I may reskim it tomorrow as I think I get can get more out of it. Then off to chapter 20, the one about preventing memory leaks. As Kochan breezed over this, I think this will be a good thing for me.
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