READING
CHAPTER 10
SECTION 4
"Sample Development"

- stretchy arrays
  - don't always know the desired size in advance
  - implement an add method that grows the array if there is no more room
    - allocate a bigger array
      - typically new size is between 125% and 200% of the original size
        - don't want to waste too much memory
        - also don't want to have to grow too often
    - copy the data over
    - point the class data to the bigger array
    - the smaller array will automatically be cleaned up
- don't worry about assertion; it's not covered for us