CSC152 2006S, Class 42: Implementing Lists with Vectors

Admin:
* Are there questions on Homework 14?

Overview:
* Adding Preconditions and Postconditions.
* Testing.
* The Vector-Based Implementation.
* Validating Positions.

Lists:
* A mutable collection, not necessarily ordered 
  * get() doesn't remove
  * Indexing is abstracted: Work with positions and pred/succ
  * Something you can iterate? (Even more abstract)
* We've designed and conditioned SimpleList
  * We can write an implementation
  * Write tests
    * Observation: Tests with little cognitive load are better (OK or FAILED rather than "READ THIS OUTPUT AND INTERPRET IT")