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Salesforce JS-Dev-101 Exam Overview:

Certification Vendor:	Salesforce
Exam Name:	Salesforce Certified JavaScript Developer I
Exam Number:	JS-Dev-101
Related Certifications:	Salesforce Certified JavaScript Developer I Lightning Web Components Specialist Superbadge
Real Exam Qty:	60 (plus up to 5 unscored pilot questions)
Certificate Validity Period:	Lifetime (No renewal required)
Available Languages:	English
Exam Duration:	105 minutes
Passing Score:	65%
Exam Format:	Multiple Select, Multiple Choice
Exam Price:	$200 USD
Sample Questions:	Salesforce JS-Dev-101 Sample Questions
Exam Way:	Online (Proctored)
Pre Condition:	Completion of the Lightning Web Components Specialist Superbadge is required to earn the full credential, though it can be completed before or after the exam.
Official Syllabus URL:	https://trailhead.salesforce.com/en/credentials/javascriptdeveloperi

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JS-Dev-101 Test Answers - JS-Dev-101 Test Preparation

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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 2	Variables, Types, and Collections: Covers declaring and initializing variables, working with strings, numbers, dates, arrays, and JSON, along with understanding type coercion and truthy falsy evaluations.
Topic 3	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 4	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.

Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q11-Q16):

NEW QUESTION # 11
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
* Will establish a web socket connection and handle receipt of messages to theserver
* Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?

A. ws.connect (( ) => {console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }};
B. try{ws.connect (( ) => {console.log('connected to client'); });} catch(error) { console.log('ERROR' ,error); };}
C. ws.on ('connect', ( ) => {console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' ,error); });}); C. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};

Answer: B

NEW QUESTION # 12
Refer to the following object:
const dog = {
firstName: 'Beau',
lastName: 'Boo',
get fullName() {
return this.firstName + ' ' + this.lastName;
}
};
How can a developer access the fullName property for dog?

A. dog.get.fullName
B. dog.fullName
C. dog.fullName()
D. dog.function.fullName()

Answer: B

Explanation:
The correct answer is A.
This object uses a getter:
get fullName() {
return this.firstName + ' ' + this.lastName;
}
A getter looks like a method when it is defined, but it is accessed like a normal property.
So the correct access syntax is:
dog.fullName
That returns:
"Beau Boo"
The important distinction is:
dog.fullName
not:
dog.fullName()
Because fullName is a getter property, not a regular function property.
Option B is incorrect because calling dog.fullName() tries to call the returned string as a function. Since "Beau Boo" is not a function, that would cause a TypeError.
Option C is incorrect because there is no get object inside dog.
Option D is incorrect because there is no function object inside dog, and getters are not accessed that way.
Therefore, the verified answer is A.

NEW QUESTION # 13
A developer initiates a server with the file server.js and adds dependencies in the source code's package.json that are required to run the server.
Which command should the developer run to start the server locally?

A. npm start server.js
B. npm start
C. node start
D. start server.js

Answer: B

Explanation:
Comprehensive and Detailed Explanation From JavaScript/Node.js Knowledge:
In a Node.js project that uses package.json, you typically define a "start" script:
{
"scripts": {
"start": "node server.js"
}
}
Then you start the app with:
npm start
npm start:
Looks up the "start" script in package.json.
Runs the command defined there (commonly node server.js).
This is the standard way to start a Node.js app with npm-managed dependencies.
Why others are incorrect:
A . node start
Tries to run a file named start with Node; does not use package.json scripts.
C . npm start server.js
npm start does not take the script filename as an argument in this way; it just runs the start script as defined.
D . start server.js
Not an npm or node command; on some shells it just tries to "start" a process but is not the standard Node/npm workflow.
Relevant concepts: package.json, npm scripts, npm start, Node entry file execution.

NEW QUESTION # 14
Refer to code below:
Let productSKU = '8675309' ;
A developer has a requirement to generate SKU numbers that are always 19 characters lon, starting with 'sku', and padded with zeros.
Which statement assigns the values sku0000000008675309 ?

A. productSKU = productSKU .padStart (16. '0').padstart(19, 'sku');
B. productSKU = productSKU .padStart (19. '0').padstart('sku');
C. productSKU = productSKU .padEnd (16. '0').padstart('sku');
D. productSKU = productSKU .padEnd (16. '0').padstart(19, 'sku');

Answer: A

NEW QUESTION # 15
Refer to the code below:
01 let timedFunction = () => {
02 console.log('Timer called.');
03 };
04
05 let timerId = setInterval(timedFunction, 1000);
Which statement allows a developer to cancel the scheduled timed function?

A. clearInterval(timedFunction);
B. clearInterval(timerId);
C. removeInterval(timedFunction);
D. removeInterval(timerId);

Answer: B

Explanation:
Comprehensive and Detailed Explanation From JavaScript Knowledge:
The code:
let timerId = setInterval(timedFunction, 1000);
setInterval schedules timedFunction to run every 1000 ms.
It returns an interval ID (here stored in timerId), which is used to cancel the interval later.
To cancel:
Use clearInterval(timerId);
This is the standard browser (and Node.js) API:
let id = setInterval(fn, delay);
clearInterval(id); stops future executions of that interval.
Check other options:
B . removeInterval(timerId);
There is no removeInterval function in the standard JavaScript timer API.
C . removeInterval(timedFunction);
Again, no such function; and timers are cancelled by ID, not by the callback function reference.
D . clearInterval(timedFunction);
clearInterval expects the ID returned by setInterval, not the callback function.
Passing the function does not cancel the timer.
Therefore, the correct statement is:
Answe r: A
Study Guide / Concept Reference (no links):
Timer APIs: setInterval and clearInterval
Relationship between timer ID and cancellation
Difference between interval ID and callback function
Basic async timing patterns in JavaScript

NEW QUESTION # 16
......

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