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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
Real Exam Qty:	60 (plus up to 5 unscored pilot questions)
Related Certifications:	Lightning Web Components Specialist Superbadge Salesforce Certified JavaScript Developer I
Exam Duration:	105 minutes
Available Languages:	English
Exam Price:	$200 USD
Certificate Validity Period:	Lifetime (No renewal required)
Exam Format:	Multiple Select, Multiple Choice
Passing Score:	65%
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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Salesforce certification JS-Dev-101 exam training materials

The third format is a web-based practice exam that is compatible with Firefox, Microsoft Edge, Safari, and Google Chrome. So the students can access it from any browser and study for Salesforce JS-Dev-101 Exam clarification. In addition, Mac, iOS, Windows, Linux, and Android support the web-based Salesforce JS-Dev-101 practice questions.

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	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 3	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 4	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.

Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q53-Q58):

NEW QUESTION # 53
Refer to the code below:
for(let number =2 ; number <= 5 ; number += 1 ) {
// insert code statement here
}
Thedeveloper needs to insert a code statement in the location shown. The code statement has these requirements:
1. Does require an import
2. Logs an error when the boolean statement evaluates to false
3. Works in both the browser and Node.js
Which meet the requirements?

A. console.debug(number % 2 === 0);
B. console.error(number % 2 === 0);
C. console.assert(number % 2 === 0);
D. assert (number % 2 === 0);

Answer: B

NEW QUESTION # 54
Given code below:
setTimeout (()=> (
console.log(1);
). 0);
console.log(2);
New Promise ((resolve, reject )) = > (
setTimeout(() => (
reject(console.log(3));
). 1000);
)).catch(() => (
console.log(4);
));
console.log(5);
What is logged to the console?

A. 2 1 4 3 5
B. 1 2 43 5
C. 1 2 5 3 4
D. 2 5 1 3 4

Answer: D

NEW QUESTION # 55
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.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); }};
B. ws.connect (( ) => {console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }};
C. try{ws.connect (( ) => {console.log('connected to client'); });} catch(error) { console.log('ERROR' ,error); };}

Answer: C

NEW QUESTION # 56
Refer to the code below:
01 const exec = (item, delay) =>{
02 newPromise(resolve => setTimeout( () => resolve(item), delay)),
03 async function runParallel() {
04 Const (result1, result2, result3) = await Promise.all{
05 [exec ('x', '100') , exec('y', 500), exec('z', '100')]
06 );
07 return `parallel is done: $(result1)$(result2)$(result3)`;
08 }
}
}
Which two statements correctly execute the runParallel () function?
Choose 2 answers

A. Async runParallel () .then(data);
B. runParallel () .then(data);
C. runParallel () .then(function(data)return data
D. runParallel ( ). done(function(data){return data;});

Answer: C,D

NEW QUESTION # 57
A page loads 50+ <div class="ad-library-item"> elements, all ads.
Developer wants to quickly and temporarily remove them.
Options:

A. Use the browser console to execute a script that removes all elements containing the class ad-library-item.
B. Use the DOM inspector to prevent the load event from firing.
C. Use the DOM inspector to remove all elements containing the class ad-library-item.
D. Use the browser console to execute a script that prevents the load event from firing.

Answer: A

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge The goal:
"Temporarily and quickly remove them."
The fastest way is to run a script in the browser console that removes all such elements:
document.querySelectorAll('.ad-library-item').forEach(el => el.remove()); This immediately removes all 50+ elements and requires no page reload.
Option analysis:
A & B: Preventing load events is unreliable and does not remove already-created DOM nodes.
C: Correct-console code can remove all matching DOM elements instantly.
D: Possible but extremely slow; removing 50+ elements one by one in the inspector is not "quick." Therefore, C is the best answer.
________________________________________
JavaScript Knowledge Reference (text-only)
The browser console can run arbitrary JavaScript that manipulates the DOM.
document.querySelectorAll() returns all matching DOM nodes.
Nodes can be removed using .remove().

NEW QUESTION # 58
......

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