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 Release1-Jan-2026
221 Questions
4.9/5.0

A developer wants to use a module called DataPrettyPrint. This module exports one default function called printDate ().
How can a developer import and use the printDate() function?

A. Option A

B. Option B

C. Option C

D. Option D

B.   Option B

Refer to the following code block:

What is the console output?

A. > Better student Jackie got 70% on test.

B. > Jackie got 70% on test.

C. > Uncaught Reference Error

D. > Better student Jackie got 100% on test

D.   > Better student Jackie got 100% on test

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 expression below:
Let x = (‘1’ + 2) == (6 * 2);
How should this expression be modified to ensure that evaluates to false?

A. Let x = (‘1’ + ‘ 2’) == ( 6 * 2);

B. Let x = (‘1’ + 2) == ( 6 * 2);

C. Let x = (1 + 2) == ( ‘6’ / 2);

D. Let x = (1 + 2 ) == ( 6 / 2);

A.   Let x = (‘1’ + ‘ 2’) == ( 6 * 2);

Explanation:

🔍 Original Expression:
let x = ('1' + 2) == (6 * 2);
Breakdown:
'1' + 2 → '12' (string concatenation)
6 * 2 → 12 (number)
'12' == 12 → true (because == does type coercion)

❓Goal:
We want to modify the expression so it evaluates to false.

✅ Correct Answer:
A. let x = ('1' + ' 2') == (6 * 2);

Why?
'1' + ' 2' → '1 2' (note the space!)
6 * 2 → 12
'1 2' == 12 → false Because '1 2' is not coercible to the number 12.

❌ Why the other options fail:
B. '1' + 2 == 12
✅ true Same as original — still evaluates to true.
C. (1 + 2) == ('6' / 2)
✅ true 3 == 3 — both sides are numbers.
D. (1 + 2) == (6 / 2)
✅ true 3 == 3 again — still true.

🧠 Key Concepts:
+ with a string → triggers string concatenation
== → performs type coercion
To force false, you need non-equivalent values after coercion

A developer creates a simple webpage with an input field. When a user enters text in the input field and clicks the button, the actual value of the field must be displayed in the
console.
Here is the HTML file content:


The developer wrote the javascript code below:
Const button = document.querySelector(‘button’);
button.addEvenListener(‘click’, () => (
Const input = document.querySelector(‘input’);
console.log(input.getAttribute(‘value’));
When the user clicks the button, the output is always “Hello”.
What needs to be done make this code work as expected?

A. Replace line 04 with console.log(input .value);

B. Replace line 03 with const input = document.getElementByName(‘input’);

C. Replace line 02 with button.addEventListener(“onclick”, function() {

D. Replace line 02 with button.addCallback(“click”, function() {

A.   Replace line 04 with console.log(input .value);

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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.