Lecture 6: September 18, 2006

Designing methods for unions.

Designing methods for unions of classes --- HtDP version, Part 1 --- Data definitions, purpose statements and contracts.

Designing methods for unions of classes --- HtDP version, Part 2 --- Complete method design.

Designing methods for unions of classes --- HtDC version.

Lectures 7 and 8: September 20 and 21, 2006

Designing methods for unions with self-reference.

Designing methods for classes that represent self-referential data.