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Lab Check-Offs

On this page, you will find a list of check-off questions for each lab.

Lab 1 Welcome to Snap!

  • No checkoff needed for Lab 1!

Lab 2 Build Your Own Blocks

  • Show your Field of Flowers.
  • Why should you Build Your Own Blocks? Give a reason that someone may create a custom block.
  • What are some different ways to achieve repetition? Name at least 2.
  • Show your random-walk sprite.
  • Show your “draw square-leaved flower…” block.

Lab 3 Conditionals, Reporters & Testing

  • What is a Boolean? Explain why we use them, and give examples of functions that report a Boolean value.
  • Show us your traffic signal and letter grade blocks.
  • Explain the difference between a command and a reporter block.
  • Show us the “is _ between _ and _ ?” block.
  • What does the mystery reporter (at the bottom of the “Reporter Blocks” page) report when run with the inputs hello and 5?
  • Name a few of the input types. Why is it important that we specify input types?
  • How are global variables different from script variables?
  • Show and explain your sum of two smallest block.

Lab 4 Lists and HOFS

  • What is a list? Why would we use a list of 10 elements instead of just making 10 variables?
  • What do map, keep, and combine each do?
  • Show us your acronym block.
  • Show us your expand block.
  • What is the difference between the for each (item) loop and the for (i) loop we have used in previous labs?

Lab 5 Algorithms

  • What is an algorithm? Please give an example both in real life and from class.
  • Please show both your “findNumberInUnsortedList” and “findNumberInSortedList” functions and describe the difference in the algorithms used.
  • Are algorithms which are (on average) faster always “better”? Why or why not?
  • What might some “trade-offs” to different computer science algorithms be?
  • How can abstraction and algorithms relate in computer science?

Lab 6 Algorithmic Complexity

  • Please show me your Non-Gauss and Gauss Add all numbers in. Which was faster? Why?
  • Of all the runtimes you have discovered thus far, can you rank them from “fastest” to “slowest”? Why is runtime important for the programs that we create?
  • Name the logarithmic time algorithm that we implemented in Lab 5. Explain why this algorithm runs in logarithmic time.
  • What is the difference between “Worst-Case” and “Best Case” Runtimes when running the Are the numbers of (LIST) distinct block? Why?
  • What happened with the time it took for your computer to counter up the numbers between 1 and x when you started doubling the numbers? Tripling the numbers? What do you think would happen with the time I multiplied your top number by 8?
  • What is an example of an algorithm that we have seen that has an exponential runtime?

Lab 7 Testing & Project 3

  • How does the test block work? What is its domain and range?
  • Show us the output of your test block on the merge column. Explain why this output makes sense.
  • How will writing tests help you for the 2048 assignment?
  • How do merge up and merge column work? What is the domain/range of each block?
  • What is the domain and range of the update display block?

Lab 8 Boards

  • Why did we have variables like “Size”, “Start”, and “Display Width” when designing our board and what do they do?
  • Show your working board game by moving the sprite around the board.
  • Explain an advantage of using an underlying board structure when designing a game.

Lab 9 Trees and Fractals

  • Why is it important that the inputs to a recursive call be smaller than the original inputs to the function?
  • Please show me your “crazy-tree” block.
  • Why is it important that the sprite face the same direction at the end of a recursive function as it faced initially?
  • What defines a recursive block? What are the two necessary “cases” that a recursive block must consider? Name and define them.
  • Please show me your “snowflake” block.

Lab 10 Recursive Reporters

  • Why do we map the first item of the set in front of a recursive call of subsets over the rest of the list?
  • Explain why the second version of subsets only makes 7 calls instead of 64.
  • Explain how the sort block works, how the merge block works, and how they work together.
  • Show us the recursive numbers block.
  • Show us the recursive ends-e block.

Lab 11HOFS and Functions as Data

  • What is a higher-order function?
  • Show us your pandigital block and explain how it works.
  • Show us your factorion block and explain how it works.
  • Show us your list all factorions function. How does this compare to the list all pandigital numbers function?

Lab 12Welcome to Python!

  • What is the difference between the “python”, “python”, and “python -i” terminal commands?
  • What is the difference between the “print” and “return” python commands?
  • Show your “reverse_string(string)” function. If you did it iteratively, explain the recursive solution. If you did it recursively, explain the iterative solution.
  • Show your “palindrome(string)” function.
  • Show your c-curve function and its output.

Lab 13Data Structures in Python

  • What is the difference between = and == in python?
  • Show us the result of running the autograder.
  • What is a dictionary?
  • What does 0-indexing mean?

Lab 14Object-Oriented Programming

  • Describe the purpose of an “init” function.
  • To access a class attribute, should you use the class name or an instance name?
  • Name two different ways to assign instance attributes.
  • Show us your “outdated” and “add_genre” methods.
  • Show us your completed MemePage and Member classes.

Lab 15Text Processing in Python

  • What are the arguments of the “open” function and what does it return?
  • Show us your “izzle” function.
  • How do we choose how something is sorted when using the “sorted” function in Python?
  • Show us your “top_n_words” and “print_top_n_words” functions.
  • Show us your “apply_language_game” function.

Lab 16Data Science

  • What are some important commands that you can use to keep only certain rows in a table?
  • Describe the three main steps of working with data as per this lab.
  • What commands did you use to find the price of the most expensive listing in San Francisco?
  • Show us your scatter plot.What are some things you notice from this plot?

Lab 17Concurrency

  • What is a race condition?
  • Is it always true that splitting a task among 10 “workers” is better than splitting it among 5 “workers”?
  • What is the difference between determinism and nondeterminism, in the context of concurrency?
  • How does Snap! handle concurrency?

Lab 18Debugging in OOP

  • Show us the result of running the docstring under the Account class in your terminal.
  • Show us the result of running the docstring under each QuidditchPlayer subclass in your terminal.
  • What is some information the terminal gives you when there’s an error in your code?