Salesforce-JavaScript-Developer Exam Questions With Explanations

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Salesforce Salesforce-JavaScript-Developer Exam Sample Questions 2025

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22214 already prepared
Salesforce Spring 25 Release10-Nov-2025
221 Questions
4.9/5.0

Given the code below:

Which method can be used to provide a visual representation of the list of users and to allow sorting by the name or email attribute?

A. console.group(usersList) ;

B. console.table(usersList) ;

C. console.info(usersList) ;

D. console.groupCol lapsed (usersList) ;

A.   console.group(usersList) ;

A developer writes the code below to calculate the factorial of a given number function sum(number){
return number * sum(number-1);
}
sum(3);
what is the result of executing the code.

A. 0

B. 6

C. Error

D. -Infinity

C.   Error

Refer to following code block:
Let array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,];
Let output =0;
For (let num of array){
if (output >0){
Break;
}
if(num % 2 == 0){
Continue;
}
Output +=num;
What is the value of output after the code executes?

A. 16

B. 36

C. 11

D. 25

A.   16

Refer to the following object: const cat ={ firstName: ‘Fancy’, lastName: ‘ Whiskers’, Get fullName() { return this.firstName + ‘ ‘ + this.lastName; } }; How can a developer access the fullName property for cat?

A. cat.fullName

B. cat.fullName()

C. cat.get.fullName

D. cat.function.fullName()

A.   cat.fullName

Refer to the code below:
const event = new CustomEvent(
//Missing Code
);
obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options could a developer insert at the placeholder in line 02 to achieve this?
Choose 2 answers

A. ‘Update’ , (
recordId : ‘123abc’

B. ‘Update’ , ‘123abc’

C. { type : ‘update’, recordId : ‘123abc’ }

D. ‘Update’ , {
Details : {
recordId : ‘123abc’

A.   ‘Update’ , (
recordId : ‘123abc’
D.   ‘Update’ , {
Details : {
recordId : ‘123abc’

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Frequently Asked Questions

Focus on modular, reusable components. Make sure you understand component lifecycle hooks, event handling, and communication between parent and child components. Practice creating custom components that interact with Apex controllers and handle asynchronous data.
Use Promises or async/await patterns in JavaScript to manage server calls. Always handle error scenarios using try/catch blocks or .catch() on Promises. In exams, expect to explain how your code prevents UI blocking and ensures data consistency.
Leverage browser DevTools to inspect console logs, network calls, and event propagation. For LWC, use the Lightning Component Debug Mode. Check Apex responses for errors and ensure proper JSON parsing before using data in the UI.
Minimize unnecessary DOM manipulations, use track and @api/@wire decorators properly, and avoid repeatedly querying the server. Lazy-load data where possible and batch Apex calls to reduce server round trips. Efficient components are a common exam scenario.
For hands-on exercises, sample problems, and exam-focused tips, check salesforceking.com. It provides practical examples specifically designed to simulate real Salesforce JavaScript Developer exam scenarios.