Week 8 Discussion/Lab Notes

Administrivia

• Midterm 2 is next week (3-15). Once again, it's a week later than usual, so keep this in mind when looking at past exams.
• Part 1 of Project 3 is due Monday of next week (3-13).
• As before, I'll try to spend most of discussion next week answering questions.
• Please fill out a course evaluation if you haven't done so already. Extra copies are in the lab.

Discussion Outline

• hw5
• 2.29 mobiles
• respect the data abstraction!
• what are the contracts to your procedures?
• do mental type-checking
• last week:
• OOP, objects with state
• this week:
• how?
• below-the-line OOP
• exact implementation details aren't important, but understand the idea (MP)
• environment diagramming
• why?
• to understand how programming languages behave
• substitutional model is no longer valid
• scope
• local state

Environment Diagrams

Here are my notes on drawing environment diagrams in PDF format. They contain instructions, examples, and exercises.

If you're still uncomfortable with environment diagrams after reading my notes, check out Benson Limketkai's notes. (And also please let me know what parts of my notes were confusing!)