This book is pretty terrible. The author rambles on incoherently from topic to topic, trying to tie together a myriad of personal opinions and little manias picked up over time, with (admittedly!) no justification for any of them. Some of the code examples are actually wrong and contain bugs, but for some reason the author decided to include them anyway because, and I swear I'm quoting, "it's wrong but that doesn't matter right now". Even if it doesn't matter... why include buggy code in the first place?
If you want to read a good book on elegant programming I would recommend Code Complete from Microsoft Press: https://www.amazon.co.uk/Code-Complete-Practical-Handbook-Construction/dp/0735619670
Do not waste your money on this book. It will teach you nothing - or worse, it may teach you to hold on to absurd, opinionated, borderline superstitious programming habits.