Javascript

Question 1

What is JavaScript used for?

Answer 1

used to create responsive, interactive elements for webpages that enhances user experience.

Question 2

Is JavaScript considered as a programming language?

Answer 2

Yes.

Question 3

Where can you insert JavaScript?

Answer 3

In head element, in body element, external file or external URL

Question 4

What can JavaScript do?

Answer 4

It can change HTML content, change HTML attributes, Change CSS style, Show and hide HTML elements.

Question 5

You do not need to add the type attribute in script tag. True or false.

Answer 5

True

Question 6

The language attribute for the script tag is necessary. True or False?

Answer 6

False.

Question 7

Is external file paid? (JavaScript)

Answer 7

No. Only external URL is paid.

Question 8

How do you add external file or external URL? (JavaScript)

Answer 8

By adding the src attribute inside script start tag.

Question 9

Does the script tag need an end tag?

Answer 9

Yes.

Question 10

What are statements in JavaScript?

Answer 10

are syntax constructs and commands that perform actions.

Question 11

Statements are separated using colons (:). True or false?

Answer 11

False. You have to use semi colons. (;)

Question 12

How do you make a one-line comment in JavaScript?

Answer 12

// comment

Question 13

How do you make a multiple line comment in JavaScript.

Answer 13

/* just like CSS */

Question 14

The one line comment in JavaScript needs an end tag. True or false.

Answer 14

False.

Question 15

Define a variable in JavaScript.

Answer 15

used to store values.

Question 16

Name at least one data type/variable type

Answer 16

string, number, object, boolean.

Question 17

A string does not require a double quote. True or false?

Answer 17

False. Without the double quote, it is not a string.

Question 18

A number requires a double quote. True or false?

Answer 18

False. With a double quote, it will become a string. It will not perform the operation as expected, because it is a string not a number value.

Question 19

What can you start your variable name with?

Answer 19

a letter, a dollar sign, and an underscore.

Question 20

what does ‘+’ do in JavaScript?

Answer 20

It adds the two operands.

Question 21

What does ‘-‘ do in JavaScript?

Answer 21

It subtracts.

Question 22

What symbol do you use to multiply in JavaScript?

Answer 22

*

Question 23

The forward slash ( / ) is used in JavaScript as an arithmetic operator to divide. True or false?

Answer 23

True.

Question 24

What symbol do you use for the modulus operator and what does it do?

Answer 24

%. It returns the remainder.

Question 25

What does the increment operator (++) do in JavaScript?

Answer 25

It increase value by one.

Question 26

The decrement operator (–) decreases the value by two. True or false?

Answer 26

False. It only decreases by one.

Question 27

+= is an assignment operator. True or false?

Answer 27

True

Question 28

What does “%=” do in JavaScript?

Answer 28

Gets the modulus of the left operand divide by right operand then returns the remainder and assigns the value to left operand.

Question 29

What does “/=” do in JavaScript?

Answer 29

It divides the left operand to right operand and assigns the value to left operand.