JS arrays

Question 1

What are arrays used for?

Answer 1

create and store a list of multiple items in a single variable/ data for the same type

Question 2

Describe array literal notation.

Answer 2

square brackets with values separated by commas

Question 3

How are arrays different from “plain” objects?

Answer 3

arrays store lists of data with numbered indexes, whereas objects store key-value pairs unordered

Question 4

What number represents the first index of an array?

Answer 4

zero, [0]

Question 5

What is the length property of an array?

Answer 5

arrayName.length

Question 6

How do you calculate the last index of an array?

Answer 6

arrayName.length -1