Unit 8 Javascript Quiz

We are writing a program that needs to store a to-do list. The most important task should be at the beginning of the to-do list, and the least important task should be at the end of the to-do list. Which data structure should we use to store the to-do list?

• Set

• List/Array

• Object

• Grid

What is the output of the following program?

• No output, there is an error when trying to add multiple copies of the same item to a set.

• Set: {4, 5, 5, 6, 6}

• et: {6, 6, 5, 5, 4}

• Set: {4, 5, 6}

Which data structure should you use to store the locations of pieces in a game of checkers?

• Object/Map

• Grid

• List/Array

• Set

You are watching a basketball game and want to keep track of how many points each player scores. Which data structure should you use to store the name of each player and how many points they score? You want to be able to look up a player’s score by their name.

• Object/Map that maps strings of text (player names) to numbers (scores)

• List/Array that holds a player name followed by a score followed by a player name and so on.

• Set that holds all the player names and scores

• Grid where each row holds a player name in the first column and their score in the second column

If you want to be able to look up values by index (1st element, 2nd element, 3rd element, etc), which data structure is best?

• Set

• List/Array

• Object/Map

• Grid

If you want to be able to look up data by coordinates / location, which data structure is best?

• Grid

• List/Array

• Set

• Object/Map

In the following code, what is the meaning of the variable x?

• x will iterate through every index in the object groceries, starting at 0 and ending at 3

• x will iterate through every key in the object groceries, taking on the values “bananas”, “apples”, “eggs”, and “oranges” in no particular order

• x will iterate through every value in the object groceries, taking on the values 4, 5, 12, and 1 in no particular order

• x is the loop counter, x keeps track of how many times the loop has run

What is the output from the following program?

• 5

• 1

• 12

• error, you cannot access a value using groceries.apples, you must use groceries["apples"]

What is an object / map?

• An unordered collection of unique items

• An ordered collection of items

• A collection of (key, value) pairs

• A collection of items stored at (row, column) locations

What kinds of elements can you store in data structures?

• Strings of text and numerical values

• Strings of text, numerical values, and graphical objects (Circles, Rectangles, etc)

• Strings of text, numerical values, and booleans

• Any kind of objects (anything you can store in a variable)