Question 1

Which function should a developer use to repeatedly execute code at a fixed interval ?

Options :

A : setIntervel

B : setTimeout

C : setPeriod

D : setInteria

Answer: A

Question 2

Given the code below:

const copy = JSON.stringify([ new String(' false '), new Bollean( false ), undefined ]);

What is the value of copy?

Options :

A : -- [ \''false\'' , { } ]--

B : -- [ false, { } ]--

C : -- [ \''false\'' , false, undefined ]--

D : -- [ \''false\'' ,false, null ]--

Answer: D

Question 3

Refer to the code below?

Let searchString = ' look for this ';

Which two options remove the whitespace from the beginning of searchString?

Choose 2 answers

Options :

A : searchString.trimEnd();

B : searchString.trimStart();

C : trimStart(searchString);

D : searchString.replace(/*\s\s*/, '');

Answer: B,D

Question 4

A developer creates a class that represents a blog post based on the requirement that a

Post should have a body author and view count.

The Code shown Below:

Class Post {

// Insert code here

This.body =body

This.author = author;

this.viewCount = viewCount;

}

Which statement should be inserted in the placeholder on line 02 to allow for a variable to be set

to a new instanceof a Post with the three attributes correctly populated?

Options :

A : super (body, author, viewCount) {

B : Function Post (body, author, viewCount) {

C : constructor (body, author, viewCount) {

D : constructor() {

Answer: C

Question 5

A developer is creating a simple webpage with a button. When a user clicks this button

for the first time, a message is displayed.

The developer wrote the JavaScript code below, but something is missing. The

message gets displayed every time a user clicks the button, instead of just the first time.

01 function listen(event) {

02 alert ( 'Hey! I am John Doe') ;

03 button.addEventListener ('click', listen);

Which two code lines make this code work as required?

Choose 2 answers

Options :

A : On line 02, use event.first to test if it is the first execution.

B : On line 04, use event.stopPropagation ( ),

C : On line 04, use button.removeEventListener(' click'' , listen);

D : On line 06, add an option called once to button.addEventListener().

Answer: C,D

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