That whenever a computation needs to walk along a list, a separate
helper function is required to perform that computation.
BE ABLE TO:
Understand the sort and insert functions that were
presented in class.
Sample Exam Question:
Look at the sort and insert functions we wrote in
class today. How would they have to be changed to sort a list-of-course
(from last week's class) in order by the total number of seats in each course?