# Week 5

Ch. 8: Processing Tables with Nested Functions

• Announcement:
• Coaching Hours posted!
• I'm grading assignments (available soon in Gradescope)

• Reminders:
• Check Campuswire regularly for important and timely class announcements, like coaching hours

• Lab 4:
• as of Sunday night, only 20/40 submissions in Gradescope…
• if you're still finishing up / need to be checked off, please see me during office hours (or see one of our coaches)
• no late penalty, but please finish ASAP (no later than this Thursday)

• Assignment 3: due this Thursday evening, 11:59pm

• Exam 1 Reminders:
• This Friday: October 1st, during lab
• Review: Wednesday

• Processing Tables
• Marc's notes:
• updated to include nested functions (this is not in Ch. 8, but it is a powerful technique)
• viewable/runnable in CPO

Review and Promises for Midterm

• Logistics:

• 75 points / 75 minutes
• budget your time one point per minute
• designed the length with a 75-minute lecture in mind
• actually have 120 minutes for our lab, so time should not be an issue

• Reference notes (from the Exams section of the syllabus):
• you may refer to an 8.5×11-inch piece of paper, double-sided, with anything written (or typed) on it that you want.
• preparing this sheet of notes is an excellent way to study, encouraging you to consider what’s important that you will want to refer to.

• You are on your honor:
• due to five sections of the course taking their exam at different times on Friday
• we will ask you to attest that you have not discussed, and will not discuss, the contents of the exam with anyone until everyone has taken the exam.
• we will let you know as soon as all students have taken the exam

• Topics:

• You are generally responsible for the material in
• chapters 1 through 8 of the DCIC text
• lectures
• labs 1–4
• assignments 1–3

• Promises:

• 6 questions, points for each question will be indicated
• sample questions shared in CPO here

• Problem 1 (15 points) Pyret expressions. Given a series of Pyret expressions, indicate either what each expression evaluates to, or whether it results in an error. Expressions may involve:
• values of type Number, String, Boolean (no Image values)
• functions that take and return those types of values
• operations/operators over those types of values
• parenthesized expressions
• named values of the form NAME = EXPRESSION
• if-else, and if-else if-else expressions

• Problem 2 (10 points) Fixing a function. Given a function with problems, identify and fix the problems.
• identifying the problems may involve carefully reading the function header, docstring, examples, and body of the function
• if the body and/or tests don't match the behavior described in the docstring, fix whatever is wrong so they do

• Problem 3 (10 points) Incomplete function: missing examples in where: clause.
• fill in missing examples–enough to fully test the function

• Problem 4 (10 points) Incomplete function: missing body.
• this time you are given the where“ clause for a function, but the rest of the function is missing!
• fill in the missing function header, docstring, and function body

• Problem 5 (10 points) Reading and understanding code. Given a function:
• indicate which tests pass or fail
• briefly describe (in words, not code) what you would need to change to make all of the tests pass

• Problem 6 (20 points) Table Processing. Multi-part question. Given a table, and a function that takes a row from the table:
• a. (2 points) fill in the expected return values in the where clause of the function
• b. (3 points) write the docstring for the function
• c. (4 points) write an expression to access the value in a particular row and column of the table
• d. (6 points) write an expression that involves some form of table processing to compute/locate a particular value within the table
• e. (6 points) given a table expression, show the resulting table
• f. (8 points) write a predicate function that takes a row of the table and determines whether that row satisfies (returns true) the given criteria.
• Midterm 1
• In SC 006 Agile Computing Lab
• At your section's usual lab time:
• Section 04: 9am-11am
• Section 05: 11am-1pm