--- tags: Setup --- # Lecture 15 Setup/Prep We're raised the question of potentially swapping out the data structure to be used for accounts. In particular, since every account has a numeric ID number, we might consider using an array. We don't need a new starter file for today. We'll add to the code from the end of the previous lecture. ## Prep Consider the following questions: - Do you think an array is a good choice of a data structure for accounts, if we want frequently open accounts and look up accounts by number, and sometimes close accounts? Why or why not? - Assume that we added a unique username to the Customer class. Would an array be useful for helping us quickly access Customers based on their usernames? Why or why not?