Overview

• Preliminaries.
  • Admin.
  • Questions on the Exam.
  • StalkerQuiz.
• Lab.
• Reflection.

Preliminaries

Admin

• Final lab writeup! Problem 6 (Due Friday) CSC151.02 Lab Writeup 31: Objects (Your Name Here)
• After today: No more readings! No more labs! No more quizzes! Just collaborative discussion, lecture, and, oh, an exam or two.
• Some of you might find this interesting http://rachelnabors.com/alice-in-videoland/book/
• If you finish the lab and extras, feel free to play on the InterWeb, but I'd like you to stay so that we can use the last few minutes to debrief.
• Upcoming extra credit opportunities:
  • Any self-care week activity.
  • One Grinnell rally today at 4pm
  • Basketball today at 5:00.
  • Learning from Alumni Thursday at 2:15: Erik Hanson (in person)
  • CS Extras Thursday at 4:30: Summer Opportunities in CS
  • CS Table Friday: Beyond Efficiency
  • Swim meet Friday/Saturday.
  • One acts Friday at 7:30 and Saturday at 2:00
• Other good things to do
  • One acts Saturday at 7:30 and Sunday 2:00
  • Is anyone in the dance ensemble?

Questions

Can I really write a procedure without a lambda?

Sure

(define increment (lambda (x) (+ x 1)))

(define increment (r-s + 1))

But that's really simple. How about something more complicated?

Sure

(define square-all (lambda (lst) (map square lst)))

(define square-all (l-s map square))

But there's no lambda? Where does square-all get its input?

(square-all '(2)) 
=> ((l-s map square) '(2))
=> ((lambda (x) (map square x)) '(2))
=> (map square '(2))
=> (list (square 2))
=> (4)

Can we document even if you say 'but do not document'?

Certainly.

Can we be more accurate than .001 on the cube root problem?

Yes, as long as your code terminates.

StalkerQuiz

• Please turn off your screens.
• The computer chose the ordering (it was the order of the image names).
• Yes, I drop the lowest quiz.

Lab

Reflection