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

• A.On line 04, use event.stopPropagation ( ),
• B.On line 04, use button.removeEventListener(' click" , listen);
• C.On line 02, use event.first to test if it is the first execution.
• D.On line 06, add an option called once to button.addEventListener().

Comment: *

Name: *

Email: *

Verification: *

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 http =require('http');
• B.const tls = require('tls');
• C.const https =require('https');
• D.const server =require('secure-server');

Comment: *

Name: *

Email: *

Verification: *

Which option is true about the strict mode in imported modules?

• A.Add the statement use strict =false; before any other statements in the module to enable
  not- strict mode.
• B.Imported modules are in strict mode whether you declare them as such or not.
• C.Add the statement use non-strict, before any other statements in the module to enable
  not-strict mode.
• D.You can only reference notStrict() functions from the imported module.

Comment: *

Name: *

Email: *

Verification: *

Which two console logs output NaN?
Choose 2 answers | |

• A.console.log(10 / Number('5) ) ;
• B.console.log(10 / 0);
• C.console.loeg(10 / 'five');
• D.console.log(parseInt ' ("two')) ;

Comment: *

Name: *

Email: *

Verification: *

A developer writes the code below to calculate the factorial of a given number.

What is the result of executing line 04?

• A.0
• B.6
• C.RuntimeError
• D.-Infinity

Comment: *

Name: *

Email: *

Verification: *