Arrays (Computer Science)

Which of the following are good examples of things to store as arrays or lists? 
I – A to-do list 
II – A grocery list 
III – A ball in a game of breakout 
IV – A list of balls in a game of breakout 
V – A loop counter variable

• II only
• III and V
• I, II, and IV
• I, II, III, IV, and V

var groceries = ["milk", "sugar", "eggs", "cake"];

What is the value of groceries[2] in the above array?

• "milk"
• "sugar"
• "eggs"
• "cake"

var shoppingList = ["milk", "eggs", "sugar", "bread", "cake"];

What is the index of the item "bread" in the array shoppingList?

• 4
• 3
• 5
• 6

What is printed by the following lines of code?

• eggs
• bread
• 2
• sugar

It is possible to have an array with 0 items.

• true
• false

What is the output from the following program?

• undefined
  25
• 20
  25
• 25
  undefined
• 20
  20

var arr = [1, 4, 55, 23, 11, 2];

What is the value of arr.length?

• 5
• 6
• 9
• 2

var firstElement = ...

Which statement will store the first element of an array arr inside of the variable firstElement?

• var firstElement = arr[0];

• var firstElement = arr[1];

• var firstElement = arr[arr.length];

• var firstElement = arr[arr.length - 1];

var lastElement = ...

Which statement will store the last element of an array arr inside of the variable lastElement?

• var lastElement = arr[0];

• var lastElement = arr[1];

• var lastElement = arr[arr.length];

• var lastElement = arr[arr.length - 1];

Describe the output of the following function:

• starting at the beginning of the array, prints each item in the array
• starting at the beginning of the array, prints each index of the array
  
• starting at the end of the array, prints each item in the array
  
• starting at the end of the array, prints each index of the array