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NEW QUESTION # 51
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?
Answer: A
Explanation:
* Node.js provides two built-in modules for creating servers:
* http # creates non-secure HTTP servers
* https # creates secure HTTPS servers
* A secure server requires:
* SSL/TLS certificates (key and cert)
* The built-in Node.js module designed to handle these: https
* Syntax for a secure server:
const https = require( ' https ' );
const fs = require( ' fs ' );
const options = {
key: fs.readFileSync( ' key.pem ' ),
cert: fs.readFileSync( ' cert.pem ' )
};
https.createServer(options, (req, res) = > {
res.write( ' Secure Server ' );
res.end();
}).listen(443);
* Evaluation of options:
* A is incorrect: No built-in module named secure-server exists.
* B is incorrect: tls provides low-level TLS sockets, not HTTP/HTTPS servers.
* C is incorrect: http only creates an insecure server.
* D is correct: https is the built-in module required for secure web servers.
JavaScript Knowledge References (text-only)
* Node.js exposes built-in modules http and https for server creation.
* Secure servers require the https module, which supports TLS/SSL.
* The tls module is lower-level and not used for full HTTP servers.
NEW QUESTION # 52
Refer to the code below:
Which code executes syhello once, two minutes from now?
Answer: C
NEW QUESTION # 53
Original code:
01 let requestPromise = client.getRequest;
03 requestPromise().then((response) = > {
04 handleResponse(response);
05 });
The developer wants to gracefully handle errors from a Promise-based GET request.
Which code modification is correct?
Answer: C
Explanation:
Key JavaScript Promise rule:
try...catch does not catch asynchronous errors that occur in Promise chains.
Therefore, the correct way to handle errors in a Promise is:
promise.then(...).catch(...);
Analysis of options:
* A and B: Both wrap asynchronous code in try...catch, which does not catch Promise rejections. try...
catch only catches errors thrown synchronously inside the block.
* C: Correct. A .catch() on the Promise chain handles any error from the Promise returned by requestPromise().
* D: .finally() executes regardless of success or failure, but it does not receive the error object , so it cannot handle the error.
Thus the only valid solution is option C .
JavaScript Knowledge References (text-only)
* Promise rejections must be handled with .catch().
* try...catch only handles synchronous code.
* .finally() does not receive a rejection reason.
NEW QUESTION # 54
A developer uses a parsed JSON string to work with user information as in the block below:
01 const userInformation = {
02 " id " : " user-01 " ,
03 " email " : " user01@universalcontainers.demo " ,
04 " age " : 25
05 };
Which two options access the email attribute in the object?
Answer: A,D
Explanation:
userInformation is a plain JavaScript object:
{
id: " user-01 " ,
email: " user01@universalcontainers.demo " ,
age: 25
}
You can access object properties in two standard ways:
* Dot notation : object.propertyName
* Bracket notation : object[ ' propertyName ' ]
Apply to each option:
* A. userInformation.email
* Correct dot notation; accesses " user01@universalcontainers.demo " .
* B. userInformation.get( " email " )
* .get() is a method on Map instances, not on plain objects.
* A regular object does not have a .get method; this would be TypeError.
* C. userInformation[ " email " ]
* Correct bracket notation; string " email " is used as the property key.
* Returns " user01@universalcontainers.demo " .
* D. userInformation[email]
* Here email is treated as a variable, not a string literal.
* Unless there is a variable named email defined with a value matching a property key, this will either:
* Throw a ReferenceError (if email is not defined), or
* Use the value of email as a computed key (not what is intended here).
* It is not the correct way to access the " email " property literal.
Therefore, the correct ways are:
The answer: A, C
Relevant concepts: object property access (. vs []), plain objects vs Map, literal property names vs computed property names.
NEW QUESTION # 55
Which two console logs outputs NaN ?
Choose 2 answers
Answer: A,C
NEW QUESTION # 56
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