Arrays: adding and removing elements

Question 1

var finalScores = ____

Answer 1

[];

Question 2

counties is an empty array. What is the value of counties[0]?

Answer 2

undefined

Question 3

What keyword removes the last element from an array?

Answer 3

pop

Question 4

What keyword adds one or more elements to the end of an array?

Answer 4

push

Question 5

Assign the number 1 to the 10th element of the array nums.

Answer 5

nums[9] = 1;

Question 6

Remove the last element from the array pets.

Answer 6

pets.pop();

Question 7

Create an empty array.

Answer 7

var airlines = [];

Question 8

Change the value of the first element of an array to a new string.

Answer 8

names[0] = “Ted”;

Question 9

Add a new element, a number, to the end of an array.

Answer 9

prices.push(99);

Question 10

Assign string values to the second and fourth elements of an array.

Answer 10

names[1] = "Sue";
names[3] = "Kate";

Question 11

add three number elements to end of an array.

Answer 11

prices.push(59, 79, 99);

Question 12

Assign the number 1 to the 10th element of the array nums.

Answer 12

nums[9] = 1;