Week 5

Ch. 8: Processing Tables with Nested Functions

• Announcement:
  • Coaching Hours posted!
  • I'm grading assignment 2 (available soon in Gradescope)
    
    

• Reminders:
  • Check Campuswire regularly for important and timely class announcements, like coaching hours
    
    
  • Lab 4:
    • quite a few people haven't handed it in yet
    • 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: Thurs
      
      

• Processing Tables
  • DCIC Ch. 8
  • Phyllis's notes:
    • review of passing functions as parameters to other functions, including nested functions (this is not in Ch. 8, but it is a powerful technique)
    • viewable/runnable in Copy of lec09.arr
    • zoom recording of lecture Passcode: L5YZmy6? (possibly useless, since I forgot to share the screen and did a lot of white-board work during class – sorry!)

Review and Promises for Midterm

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

• Exam outline: not finalized yet!
  
  
  • 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 (5 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 (6 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 (29 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
• No lab, but we'll still meet in SC 309 at usual lab time for the test