Quiz 2026 Perfect Salesforce Valid JS-Dev-101 Test Sample

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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Objects, Functions, and Classes: Covers function, object, and class implementations to meet business requirements, along with the use of modules, decorators, variable scope, and execution flow.
Topic 2	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 3	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Topic 4	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.

>> Valid JS-Dev-101 Test Sample <<

100% Pass 2026 JS-Dev-101: Marvelous Valid Salesforce Certified JavaScript Developer - Multiple Choice Test Sample

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q92-Q97):

NEW QUESTION # 92
A developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality. The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Which code logs an error at boot time with an event?

A. server.catch((error) => {
console.log('ERROR', error);
});
B. server.on('error', (error) => {
console.log('ERROR', error);
});
C. server.error((error) => {
console.log('ERROR', error);
});
D. try {
server.start();
} catch(error) {
console.log('ERROR', error);
}

Answer: B

Explanation:
Event-driven Node-style APIs expose events via .on(eventName, handler).
To listen for error events:
server.on('error', (error) => {
console.log('ERROR', error);
});
A and B assume methods .error or .catch that don't exist on typical event emitters.
C only catches synchronous errors from server.start(), not async event-based errors.

NEW QUESTION # 93
A developer wants to set up a secure web server withNode.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 server =require('secure-server');
C. const https =require('https');
D. const tls = require('tls');

Answer: C

NEW QUESTION # 94
A developer has an ErrorHandler module that contains multiple functions.
What kind of export be leverages so that multiple functions can beused?

A. Default
B. Named
C. All
D. Multi

Answer: B

NEW QUESTION # 95
Refer to the code below:
let timeFunction =() => {
console.log('Timer called.");
};
let timerId = setTimeout (timedFunction, 1000);
Which statement allows a developer to cancel the scheduled timed function?

A. clearTimeout(timedFunction);
B. removeTimeout(timedFunction);
C. clearTimeout(timerId);
D. removeTimeout(timerId);

Answer: C

NEW QUESTION # 96
A developer wants to use a module called DatePrettyPrint.
This module exports one default function called printDate().
How can the developer import and use printDate()?

A. import printDate from '/path/DatePrettyPrint.js';
DatePrettyPrint.printDate();
B. import printDate from '/path/DatePrettyPrint.js';
printDate();
C. import DatePrettyPrint() from '/path/DatePrettyPrint.js';
printDate();
D. import DatePrettyPrint from '/path/DatePrettyPrint.js';
DatePrettyPrint.printDate();

Answer: B

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge ES Modules follow these rules:
Default exports are imported using:
import anyName from 'module'
The name chosen in the import does NOT need to match the exported name.
If a module exports:
export default function printDate() {}
then consuming code should import the function directly:
import printDate from '/path/DatePrettyPrint.js';
To execute it:
printDate();
Option analysis:
A incorrect:
import DatePrettyPrint() is invalid syntax.
Also calling printDate() without importing it is incorrect.
B incorrect:
A default export imported as DatePrettyPrint gives the function itself, not an object containing methods.
You cannot call DatePrettyPrint.printDate().
C incorrect:
Imports printDate but then calls DatePrettyPrint.printDate(), which does not exist.
D correct:
Correct import of a default-exported function.
Correct direct invocation.
________________________________________
JavaScript Knowledge Reference (text-only)
Default export → imported without braces.
Importing default functions gives a callable function, not an object.
Correct syntax: import identifier from "module".

NEW QUESTION # 97
......

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