Hey, glad you liked my two wishes. Yes, data structures usually define programs. The code tends to follow more or less naturally from the data structure and th

Hey, glad you liked my two wishes. Yes, data structures usually define programs. The code tends to follow more or less naturally from the data structure and the interactions with it. If you misdesign the key data structures of your program it will balloon in size and complexity. Edge case bugs will swallow you alive. If you make it just right typically (almost) everything will fall in place. This is still true in 2019, even with all of the distributed aspects that have been added to most programs/systems of programs. I agree about that book, it's good stuff.