Try Salesforce : JavaScript-Developer-I valid & accurate questions and answers
Last Updated: Oct 13, 2026
No. of Questions: 149 Questions & Answers with Testing Engine
Download Limit: Unlimited
Free and valid exam torrent helps you to pass the JavaScript-Developer-I exam with high score.
Each questions and answers torrent of Exams-boost are edited and summarized by our specialist with utmost care and professionalism. What you get from the JavaScript-Developer-I exam training torrent is not only just passing the exam successfully, but also enlarging your scope of knowledge and enriching your future. Salesforce JavaScript-Developer-I free download pdf is really trustworthy for you to depend on
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Salesforce JavaScript-Developer-I Practice Q&A's
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Exam-day nerves shrink when the environment feels rehearsed. The Exams-boost desktop engine mirrors the real JavaScript-Developer-I testing atmosphere offline, turning the Salesforce Certified JavaScript Developer (JS-Dev-101) into a routine you have already practiced — a calm advantage worth having in 2026.
Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Browser and DOM Interaction | - Event handling and propagation - DOM manipulation and traversal - Browser APIs (fetch, storage, timers) |
| Topic 2: Testing and Debugging | - Debugging techniques and tools - Unit testing principles |
| Topic 3: JavaScript Language Fundamentals | - Data types, variables, and operators - Functions, scope, and closures - ES6+ syntax and features |
| Topic 4: Salesforce Platform Integration | - Lightning Web Components (LWC) JavaScript usage - Security considerations in Salesforce JavaScript - Calling Apex methods from JavaScript |
| Topic 5: Asynchronous JavaScript | - Event loop and concurrency model - Promises and async/await - Error handling in async workflows |
Salesforce JavaScript-Developer-I Exam FAQs: Read This Before You Register
The Salesforce Certified JavaScript Developer (JS-Dev-101) blueprint comprises 5 domains. The headline areas: Asynchronous JavaScript, Browser and DOM Interaction, and Testing and Debugging. The complete outline — every domain, every weight — is in the syllabus section above; let it decide where your study hours go.
Book the Salesforce Certified JavaScript Developer (JS-Dev-101) through these official channels:
While you schedule, keep this in mind: the JavaScript-Developer-I exam is delivered Online proctored or onsite testing via Kryterion Webassessor.
On delivery: the download unlocks immediately after payment, and an email copy reaches your inbox within one minute. If 2 hours pass with no email, check spam and contact our support team. Install the software on as many computers as you need — no device cap.
On results: if you take the JavaScript-Developer-I exam within 60 days of purchase and do not pass, the Exams-boost money back guarantee applies. File within 2 days of the exam with a scanned enrollment slip and the official score report (PDF); processing completes within 7 days. The candidate name must match the payer name, and the policy excludes exams taken within 3 days of purchase, purchases never used in an actual exam attempt, free materials, and expired orders. If you would rather not refund, exchange the product for two free exam packages of equal value and keep the update service on your original purchase.
The JavaScript-Developer-I exam — formally the Salesforce Certified JavaScript Developer (JS-Dev-101) — is how Salesforce certifies that you can apply its technologies in professional scenarios; passing earns you the JavaScript Developer I certification, positioned at the Professional level. In an anxious, competitive job market, a vendor-issued credential is one of the few signals employers trust at a glance. It also connects naturally to Salesforce Certified Platform Developer I, Salesforce Certified Platform App Builder, Salesforce Certified JavaScript Developer I as a follow-on step.
The JavaScript-Developer-I exam packs 60 questions into 105 minutes. That ratio makes pacing a testable skill in itself: linger too long on one item and easier points expire unanswered. Build the habit before it matters — run timed, full-length mocks in the Exams-boost desktop or online test engine, practice flagging and returning, and make time pressure feel ordinary.
Yes — and deciding after the trial is exactly how we prefer it. Exams-boost publishes a free PDF demo of the JavaScript-Developer-I materials so you can judge the question quality and verified answers firsthand. A full purchase then includes 365 days of free updates, and if the product expires, the update service renews at a 50% discount from your member zone.
The passing mark is 65%, and official registration runs USD 200 (may vary by region/tax). Keep one fact in view: that fee covers a single attempt, and a retake is billed at full price again. Protect the investment by rehearsing first — cycle through 149 practice questions at Exams-boost in timed mode until your scores clear the bar with room to spare.
Yes — for the Salesforce Certified JavaScript Developer (JS-Dev-101), Salesforce lists these training resources:
Training explains the concepts; repetition under exam conditions makes them reliable. Add 149 practice questions from Exams-boost to whichever course you choose, and your preparation covers both sides of the test.
No formal prerequisites, but familiarity with JavaScript and Salesforce platform development is strongly recommended.
Vendor rules do get revised, so before you lock in an exam date, verify the latest requirements on the official Salesforce exam page.
Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions:
Code:
01 const sayHello = (name) = > {
02 console.log( ' Hello ' , name);
03 };
04
05 const world = () = > {
06 return ' World ' ;
07 };
08
09 sayHello(world);
This does not print " Hello World " .
What change is needed?
- A. Change line 7 to }();
- B. Change line 9 to sayHello(world)();
- C. Change line 5 to function world() {
- D. Change line 2 to console.log( ' Hello ' , name());
Correct Answer: D 🗳️
Explanation: Only visible for Exams-boost members. You can sign-up / login (it's free).
Refer to the code below:
01 function changeValue(param) {
02 param = 5;
03 }
04 let a = 10;
05 let b = a;
06
07 changeValue(b);
08 const result = a + ' - ' + b;
What is the value of result when the code executes?
- A. 5-5
- B. 10-10
- C. 5-10
- D. 10-5
Correct Answer: B 🗳️
Explanation: Only visible for Exams-boost members. You can sign-up / login (it's free).
Refer to the code:
01 console.log( ' Start ' );
02 Promise.resolve( ' Success ' ).then(function(value) {
03 console.log( ' Success ' );
04 });
05 console.log( ' End ' );
What is the output after the code executes successfully?
- A. Start
Success
End - B. Start
End
Success - C. End
Start
Success - D. Success
Start
End
Correct Answer: B 🗳️
Explanation: Only visible for Exams-boost members. You can sign-up / login (it's free).
Refer to the code below:
01 const myFunction = arr = > {
02 return arr.reduce((result, current) = > {
03 return result + current;
04 }, 10);
05 }
What is the output of this function when called with an empty array?
- A. Throws an error
- B. Returns NaN
- C. Returns 0
- D. Returns 5 # (Text here appears to be a typo; correct value is 10, see explanation.)
Correct Answer: D 🗳️
Explanation: Only visible for Exams-boost members. You can sign-up / login (it's free).
Given the JavaScript below:
function onLoad() {
console.log( " Page has loaded! " );
}
Where can the developer see the log statement after loading the page in the browser?
- A. On the webpage console log
- B. In the browser performance tools log
- C. On the terminal console running the web server
- D. On the browser JavaScript console
Correct Answer: D 🗳️
Explanation: Only visible for Exams-boost members. You can sign-up / login (it's free).
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