56K , 100K Control structures, abstract classes. The Smalltalk syntax does not have if statements or loops. Instead, it has blocks and messages. Polymorphism, double-dispatching, and Smalltalk numbers. Some languages have arrays and strings built in, but Smalltalk does not.
Collection is an abstract class.
Sep 8 - Collections. Sep 10 - Lecture 6, part 1 56K , 100K Testing. See the testing framework that you should use from now on. Sep 15 - Object Identity. Streams , a simple example of object composition.