• Continue lab partners. Friday will be with your project group.

Overview

• Preliminaries.
  • Admin.
  • Upcoming Work.
  • Extra Credit.
  • Questions.
• On reverse
• Topic review
• Lab
• Debrief

Preliminaries

Admin

• Quiz 10 returned. Generally good jobs.
• Before I return quiz 9, I want to discuss issues with it. (So I'll return it Friday.)
• Project proposals are on my agenda for tonight.
• Friday quiz topics: Randomized drawing, Higher-order procedures, analysis, association lists.
• Reminder: Review sessions on Wednesday (8pm) and Thursday (10am and 8pm)!

Upcoming Work

• Lab writeup: Exercises 1 and 4c: http://bit.ly/151-2014F-w44
• No reading for Friday. Friday is a project work day.
• Part two of the project due next Tuesday.
• Nothing due the week after Turkey break.
  
  • We may distribute exam 4 next Wednesday for those who want to use break time to work on the exam. But it will be designed as if we distributed it immediately after break.

Fun Things

• "Jingle Bell Holiday" in town on Friday night. (Yes, crash commercialism has moved this before Thanksgiving.) http://www.grinnellchamber.org/whats_new.cfm?newsID=142
• Showvember Friday in Gardner

Extra Credit Opportunities

Academic

• CS Extras Thursday (tomorrow): Text Recognition in Maps
• CS Table Friday: One Year After Healthcare.gov https://www.youtube.com/watch?v=7Vc8sxhy2I4
• CS Extras Tuesday the 25th: Summer Opportunities in CS

Peer Support

• Karan's radio show 11pm Thursday nights on KDIC
• Evan's radio show 5pm Friday nights on KDIC
• Donna's radio show Sunday midnight on KDIC
• Noteworthy & One acts, coming soon
• Swimming and Diving at Loras on Saturday

Miscellaneous

• VP Student Affairs Candidate Open Sessions
  • Wednesday, 4:15, JRC 209
  • Friday, 4:15, JRC 209

Questions

On Reverse

Why is reverse1 so much worse than reverse2?

• Doubly recursive. We recuse over the list and we also call append which recurses over the list.

Partner Time

What were the key ideas in the reading?

• If we have lists of lists we can effectively treat them as tables
• We can use assoc to look up things in those tables

What lingering questions do you have?

Why in implementing assoc do you take the car of the car?

The first car grabs the line of the table (the first element).

The second car grabs the first element of that list/line, which is what we serach by.