Javascript Arays

Question 1

What are arrays used for?

Answer 1

To store an ordered collection of data

Question 2

Describe array literal notation.

Answer 2

const arrayName = [value0, value1, etc];

Question 3

How arrays different from “plain objects” ?

Answer 3

Arrays are numerically ordered where plain objects are not

Question 4

What array number represents the first index of an array ?

Answer 4

0

Question 5

What is the length property of an array ?

Answer 5

The highest numerical index in an array plus 1

Question 6

How do you calculate the last index of an array ?

Answer 6

arrayName.length -1 or arrayName.at(-1);