Overview

• Preliminaries.
  • Admin.
  • Upcoming Work.
  • Extra Credit.
  • Questions.
• Lab.
• Reflection.

Preliminaries

Admin

• Retain partners!
• When you send questions on homework, please carbon-copy your partner.
• Review sessions Thursday night and Thursday day.
• Office hours today at and 2:45-4:15 p.m. Office hours Wednesday at 10:00 a.m.
  • I am trying to make office hours available for any time that I am not booked with other activities. You will see more appear as time goes on.
  • http://rebelsky.youcanbook.me
• I have a few people who won't be able to work on the assignment until Sunday night at the earliest. Does anyone want to partner with them? (Is anyone one of them?) If so, send me an email message.

Upcoming Work

• Homework 5.
  • Due TONIGHT at 10:30 p.m.
  • Graders say "Remember that we copy-and-paste from email to DrRacket"
• Homework 6 to be assigned tomorrow.
• Exam 2 to be assigned in a week.
• Lab writeup for today: 5d and 6b http://bit.ly/151-2015S-lab21
• Reading for Wednesday
  • Images as Functions

Extra Credit Opportunities

Academic

• Pioneer Diversity Council Diversity Dialogue, 8:30 p.m. 26th, Main Quad "Academic Athletes and Academic Students".
• CS Table Friday - Art, CS, and Artificial Intelligence.

Peer Support (Afternoon Section)

• Indoor Track this Saturday
• Mens BBall Tournament at St. Norbert.

Other Good Things

• Neverland Players this weekend.

Questions

Lab

• Don't skip ahead to the writeup exercises! There's time to do all six exercises.
• A note from the other section: Students in that section are starting to see that they find it useful to copy things from the interactions pane into the defintions pane and then comment them out so that they have a record of what they've done.

Reflection

Please explain the meanings of the orderings of let and lambda.

You can't use a name until it is bound (either through define or let, or by coming in as a parameter).

But you can bind a name before you define a procedure, and limit that binding to use within that procedure, by writing something like (let ([name value]) (lambda (param) body)).