Javascript-arrays

Question 1

What are arrays used for?

Answer 1

Arrays are used to store a list of values that are related to each other.

Question 2

Describe array literal notation.

Answer 2

An array consists of a square bracket that holds a list of values, separated by commas. And it’s assigned to a variable.

Question 3

How are arrays different from “plain” objects?

Answer 3

The values in an array is stored in index number, while the values in an object is stored in a property.

Question 4

What number represents the first index of an array?

Answer 4

0.

Question 5

What is the length property of an array?

Answer 5

It’s the number of items in an array.

Question 6

How do you calculate the last index of an array?

Answer 6

Use the length property of the array and minus 1.