Javascript-arrays-Q&A

Question 1

What are arrays used for?

Answer 1

An array is a special type of variable. It doesn’t

just store one value; it stores a list of values.

Question 2

Describe array literal notation.

Answer 2

The values are assigned to the array inside a pair of square brackets, and each value is separated by a comma.

Question 3

How are arrays different from “plain” objects?

Answer 3

Objects represent “things” with characteristics (aka properties), while arrays create and store lists of data in a single variable.

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

Length is a property of arrays in JavaScript that returns or sets the number of elements in a given array.

Question 6

How do you calculate the last index of an array?

Answer 6

Subtracting 1 from the length of an array gives the index of the last element of an array using which the last element can be accessed.