CSC151 2007S, Class 42: Pairs and Pair Structures

Admin:
* SLC
* EC: Comedian Kumail Nanjiani '01 at 8:00 Friday in Main.
* EC: Women's Basketball Saturday at 1:30 in the new Darby.
* EC: Orchestra Concert 2:00 on Saturday in the old Herrick.
* Short discussion of assignment 14
* Assignment 15 is ready [optional for extra credit].
* Our favorite class activity

Overview:
* Memory and naming.
* Pairs and cons cells.
* Why care?

Lists, Revisited:
* A list is an ordered collection of items
* Ways to build lists:
  * list operation [NOT WHAT SAM WANTED]
  * cons + null