EBoard 13: Lists (Section 3)

Please follow the standard start-of-class routine.

Warning! You are being recorded (and transcribed) (provided the technology is working correctly).

Approximate overview

• Administrative stuff
• Q&A
• Lab

Administrative stuff

Introductory Notes

• Happy lucky class 13!
• Note that Scamper is now at 4.6.0.
• LAs and grade reports to be distributed later today.
• Expect email from me if you’re behind on LAs.
• Congratulations to our football team for another victory!
• Apologies: I was not able to get the autograder working for this mini-project.
• There are a few of you who have already missed more than six readings. I’m considering the best way to deal with that issue. I would welcome suggestions via email.
• I’ve made two minor changes to the grading policies.
  • 20 LAs now earns you an A+, rather than an A. Grinnell doesn’t let me award A+’s, but this makes some of the other grades more achievable.
  • You now start with four tokens rather than three.
• The pictorial class rosters are available at the back of the classroom. You may not use them as a cheat sheet for Friday’s quiz, but you can use them as a study sheet.

Attendance

• Practice for Friday’s quiz.

Some notes from the quizzes

• There was some confusion on substring, even though you used it in the strings lab. (substring str start end)
  • We number characters starting at 0.
  • The second number in substring is the index of the first character not included in the result.
  • (substring "Television" 1 4) -> "ele"
  • Don’t forget to record information about procedures in your notebook (and on your cheat sheets).
• Remember that o applies procedures right to left. That is, (o f g h), the resulting procedure applies h, then g, then f.
• At this point, I expect something close to correct Scheme syntax on LAs, particularly if unclear syntax leaves open the question as to whether or not you understand the material.

Upcoming activities

Scholarly

• Tuesday, 29 September 2026, Noon–1:00 p.m., JRC 224C (I think). CS Table: Open-source software
  • Sam forwarded email with readings.
• Wednesday, 30 September 2026, 8:00–9:30 p.m., HSSC A2231. Reading as a Way of Life
• Thursday, 1 October 2026, 11:00 a.m.–Noon, JRC 101. Scholars’ Convocation: Christian Flemm: Medium Intimacy
• Friday, 2 October 2026, 4:15–4:45 p.m., HSSC A1231 (the Kernel). Cory McCarten ‘19: What Math and Data Can (and Cannot) Tell us about Gerymandering and Voting Rights
• Friday, 2 October 2026, 5:30–7:30 p.m., Weingart Pavilion. Pioneer Weekend Kickoff

Artistic/Cultural

• Any day. Visit the GCMOA for at least 30 minutes.
• Thursday, 1 October 2026, 4:00–5:30 p.m., HSSC S1325. Writers@Grinnell presents a conversation with Poet Maggie Millner
• Thursday, 1 October 2026, 4:15–5:30 p.m., GCMOA. Johnnie Chatman: The Artist as Researcher
• Thursday, 1 October 2026, 4:00–5:30 p.m., HSSC A2231. Writers@Grinnell presents a reading by Poet Maggie Millner
• Friday, 2 October 2026, 7:00 p.m., Wall Theatre. Neverland Players
• Saturday, 3 October 2026, 2:30 p.m., Wall Theatre. Neverland Players
• Saturday, 3 October 2026, 7:00 p.m., Wall Theatre. Neverland Players
• Sunday, 4 October 2026, 2:30 p.m., Wall Theatre. Neverland Players

Multicultural

• Friday, 2 October 2026, 4:10–5:00 p.m., HSSC N1170 Middle of Everywhere (Turkeye)

Peer

Musical, theatric, sporting, academic, and similar events involving this section’s students are welcome.

• Saturday, 3 October 2026, 1:00–4:00 p.m., Rosenbloom Field. Football vs. Knox

Wellness

• Monday, 28 September 2026, 6:30–8:00 p.m., Bear Dance Studio. Brazilian Jiu-Jitsu
• Monday, 28 September 2026, 8:00–9:00 p.m., Prayer Garage. Meditation Group
• Tuesday, 29 September 2026, 4:30–6:00 p.m., Bear P103. Wellness Yoga
• Wednesday, 30 September 2026, 4:15–5:45 p.m., Undisclosed Location. Forest Bathing
• Wednesday, 30 September 2026, 6:30–8:00 p.m., Bear Dance Studio. Brazilian Jiu-Jitsu
• Saturday, 10 October 2026, All Day, Somewhere. Mental Health Training.
  • Sign up on Handshake.
  • It’s all day, so you will earn 3 tokens.

Misc

• Wednesday, 30 September 2026, 8:00–9:00 p.m., Science 3820. (D&M) Mentor Session
• Thursday, 1 October 2026, 8:00–9:00 p.m., Science 3820. (K) Mentor Session
• Thursday, 1 October 2026, 4:00–5:30 p.m., CS Commons. Matcha and Milk Study Break

Other good things

These do not earn tokens, but are worth your consideration.

• Tuesday, 29 September 2026, 4:00–6:00 p.m., Springer Field. Women’s Soccer vs. Luther College
• Wednesday, 30 September 2026, 4:00–6:00 p.m., Springer Field. Men’s Soccer vs. Luther College
• Saturday, 3 October 2026, 1:00–3:00 p.m., Springer Field. Men’s Soccer vs. U. Dubuque. New
• Saturday, 3 October 2026, 3:30–5:30 p.m., Springer Field. Women’s Soccer vs. U. Dubuque. New

Upcoming work

• Due Tuesday, 2026-09-29 at 10:30 p.m.
  • Today’s lab: List basics
    • Submit lab writeup on Gradescope
    • Submit at the end of class.
  • Readings:
    • Reading: The “big three” list operations
    • Reading: More list operations
    • Submit reading responses on Gradescope
  • Mini-project 2
    • Submit on gradescope
• On Friday, 2026-09-02
  • NEW Quiz/LA on collaboration (identify your classmates; just first name)
  • NEW Quiz/LA on lists
  • MAKEUP Quiz/LA on conditionals.
  • MAKEUP Quiz/LA on compose, cut, and section.
  • MAKEUP Quiz/LA on tracing.
  • MAKEUP Quiz/LA on decomposition.
  • MAKEUP Quiz/LA on procedures.
• Due Tuesday, 2026-10-06
  • Mini-project 1 redo
    • When submitting a mini-project redo, please include a file called CHANGES.txt that describes what you’ve changed.

Questions

Administrative questions

When else can I take a quiz?

Section 1 takes quizzes on Friday from 7:30–8:30.

Section 2 takes quizzes on Fridays from 10:30–11:30.

Section 3 takes quizzes on Fridays from 3:30–4:30.

What do I do if I’m missing a lot of quizzes?

Try coming at some of the other times. Each quiz should take no more than fifteen minutes, so you should be able to try four during a typical class plus extra session.

Get help! Sign up for times with Sam, visit with the evening tutors, go to mentor sessions, etc.

What should the CHANGES.txt file have?

A summary of what you’ve changed. E.g.,

• I forgot to write a procedure for part 2. My new procedure is called make-eye and it gets used in making the face that is my-image.

MP2 questions

Reading questions

Sam didn’t get to these.

Lab

Don’t forget to reload Scamper.

Remember: If you’re asked to load a Racket file, you probably have the old version of the lab.