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Salesforce JavaScript-Developer-I exam is designed to test a candidate's knowledge of JavaScript programming concepts and their ability to develop custom applications using the Salesforce Lightning Platform. JavaScript-Developer-I exam is an essential step towards becoming a Salesforce Certified JavaScript Developer I and is recognized globally as a valuable credential for developers who want to specialize in building complex, scalable, and customizable applications on the Salesforce platform.
Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
Earning the Salesforce JavaScript-Developer-I certification can open up many career opportunities for developers, as it demonstrates their expertise in building custom solutions on the Salesforce platform. It can also lead to higher salaries and increased job satisfaction, as well as recognition from peers and employers.
Salesforce JavaScript-Developer-I Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-001 |
| Available Languages: | English |
| Exam Duration: | 105 minutes |
| Certificate Validity Period: | 1 year (maintenance required via Salesforce certification maintenance modules) |
| Related Certifications: | Salesforce Certified JavaScript Developer I Salesforce Certified Platform App Builder Salesforce Certified Platform Developer I |
| Exam Price: | USD 200 (may vary by region/tax) |
| Passing Score: | 65% |
| Real Exam Qty: | 60 |
| Exam Format: | Multiple Choice, Multiple Select |
| Recommended Training: | Salesforce Trailhead JavaScript Developer I Prep Salesforce Developer Learning Paths |
| Exam Registration: | Salesforce Credentials Page Salesforce Certification Registration (Webassessor) |
| Sample Questions: | Salesforce JavaScript-Developer-I Sample Questions |
| Exam Way: | Online proctored or onsite testing via Kryterion Webassessor |
| Pre Condition: | No formal prerequisites, but familiarity with JavaScript and Salesforce platform development is strongly recommended. |
| Official Syllabus URL: | https://trailhead.salesforce.com/credentials/javascriptdeveloper1 |
Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Browser and DOM Interaction | - DOM manipulation and traversal - Event handling and propagation - Browser APIs (fetch, storage, timers) |
| Topic 2: Testing and Debugging | - Unit testing principles - Debugging techniques and tools |
| Topic 3: Salesforce Platform Integration | - Security considerations in Salesforce JavaScript - Lightning Web Components (LWC) JavaScript usage - Calling Apex methods from JavaScript |
| Topic 4: Asynchronous JavaScript | - Promises and async/await - Error handling in async workflows - Event loop and concurrency model |
| Topic 5: JavaScript Language Fundamentals | - Data types, variables, and operators - ES6+ syntax and features - Functions, scope, and closures |
Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions:
Refer to the code below:
01 new Promise((resolve, reject) = > {
02 const fraction = Math.random();
03 if (fraction > 0.5) reject( ' fraction > 0.5, ' + fraction);
04 resolve(fraction);
05 })
06 .then(() = > console.log( ' resolved ' ))
07 .catch((error) = > console.error(error))
08 .finally(() = > console.log( ' when am I called? ' ));
When does Promise.finally on line 08 get called?
- A. When resolved and settled
- B. When resolved
- C. When rejected
- D. When resolved or rejected
Correct Answer: D 🗳️
Explanation: Only visible for SurePassExams members. You can sign-up / login (it's free).
Most accurate tests for:
const arr = Array(5).fill(0);
- A. console.assert(arr.length === 5);
- B. console.assert(arr[5] === 0 & & arr.length === 0);
- C. arr.forEach(e = > console.assert(e === 0));
- D. console.assert(arr.length === 0);
Correct Answer: A,C 🗳️
Explanation: Only visible for SurePassExams members. You can sign-up / login (it's free).
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 " : " [email protected] " ,
04 " age " : 25
05 };
Which two options access the email attribute in the object?
- A. userInformation.get( " email " )
- B. userInformation.email
- C. userInformation[ " email " ]
- D. userInformation[email]
Correct Answer: B,C 🗳️
Explanation: Only visible for SurePassExams members. You can sign-up / login (it's free).
Refer to the code below:
01 const server = require( ' server ' );
02
03 // Insert code here
A developer imports a library that creates a web server. The imported library uses events and callbacks to start the server.
Which code should be inserted at line 03 to set up an event and start the web server?
- A. server((port) = > { console.log( ' Listening on ' , port); });
- B. server.start();
- C. server.on( ' connect ' , (port) = > { console.log( ' Listening on ' , port); });
- D. server();
Correct Answer: A 🗳️
Explanation: Only visible for SurePassExams members. You can sign-up / login (it's free).
Which two code snippets show working examples of a recursive function?
- A. const sumToTen = numVar = > {
if (numVar < 0)
return;
return sumToTen(numVar + 1);
}; - B. const factorial = numVar = > {
if (numVar < 0) return;
if (numVar === 0) return 1;
return numVar * factorial(numVar - 1);
}; - C. let countingDown = function(startNumber) {
if (startNumber > 0) {
console.log(startNumber);
return countingDown(startNumber - 1);
} else {
return startNumber;
}
};
(Note: Option D is shown here with corrected syntax: lowercase return and matching parentheses.) - D. function factorial(numVar) {
if (numVar < 0) return;
if (numVar === 0) return 1;
return numVar - 1;
}
Correct Answer: B,C 🗳️
Explanation: Only visible for SurePassExams members. You can sign-up / login (it's free).
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