JavaScript-Developer-I Practice Test

Given the following code:
Let x =(‘15’ + 10)*2;
What is the value of a?

A.

3020

B.

1520

C.

50

D.

35

A developer creates an object where its properties should be immutable and prevent
properties from being added or modified.
Which method should be used to execute this business requirement ?

A.

Object.const()

B.

Object.eval()

C.

Object.lock()

D.

Object.freeze()

Given the following code:
document.body.addEventListener(‘ click ’, (event) => {
if (/* CODE REPLACEMENT HERE */) {
console.log(‘button clicked!’);
)
});
Which replacement for the conditional statement on line 02 allows a developer to
correctly determine that a button on page is clicked?

A.

Event.clicked

B.

e.nodeTarget ==this

C.

event.target.nodeName == ‘BUTTON’

D.

button.addEventListener(‘click’)

Refer to the expression below:

Let x = (‘1’ + 2) == (6 * 2);
How should this expression be modified to ensure that evaluates to false?

A.

Let x = (‘1’ + ‘ 2’) == ( 6 * 2);

B.

Let x = (‘1’ + 2) == ( 6 * 2);

C.

Let x = (1 + 2) == ( ‘6’ / 2);

D.

Let x = (1 + 2 ) == ( 6 / 2);

A developer wants to set up a secure web server with Node.js. The developer creates a
directory locally called app-server, and the first file is app-server/index.js
Without using any third-party libraries, what should the developer add to index.js to create
the
secure web server?

A.

const https =require(‘https’);

B.

const server =require(‘secure-server’);

C.

const tls = require(‘tls’);

D.

const http =require(‘http’);