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Updated: Oct 11, 2026
No. of Questions: 149 Questions & Answers with Testing Engine
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Salesforce JS-Dev-101 Exam Syllabus Topics:
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Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
Salesforce JS-Dev-101 Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer - Multiple Choice |
| Exam Number: | JS-Dev-101 |
| Exam Format: | Multiple select, Multiple choice |
| Exam Duration: | 105 minutes |
| Real Exam Qty: | 60 scored + up to 5 unscored |
| Available Languages: | Japanese, English |
| Exam Price: | USD 200 |
| Certificate Validity Period: | Does not expire; requires maintenance updates |
| Related Certifications: | Salesforce Certified Developer Salesforce Certified Platform Developer I |
| Passing Score: | 65% |
| Recommended Training: | Trailhead JavaScript Developer I Certification Prep |
| Exam Registration: | Salesforce Certification Registration |
| Sample Questions: | Salesforce JS-Dev-101 Sample Questions |
| Exam Way: | Online proctored or onsite at authorized testing centers |
| Pre Condition: | No formal prerequisites; recommended: strong JavaScript fundamentals, ES6+ experience, web development familiarity |
| Official Syllabus URL: | https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101 |
Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions:
A developer creates a simple webpage with an input field. When a user enters text and clicks the button, the actual value must be displayed in the console:
HTML:
<input type="text" value="Hello" name="input">
<button type="button">Display</button>
JavaScript:
01 const button = document.querySelector('button');
02 button.addEventListener('click', () => {
03 const input = document.querySelector('input');
04 console.log(input.getAttribute('value'));
05 });
When the user clicks the button, the output is always "Hello".
What needs to be done to make this code work as expected?
- A. Replace line 04 with console.log(input.value);
- B. Replace line 02 with button.addCallback("click", function() {
- C. Replace line 02 with button.addEventListener("onclick", function() {
- D. Replace line 03 with const input = document.getElementByIdName('input');
Correct Answer: A 🗳️
Explanation: Only visible for Exam-Killer members. You can sign-up / login (it's free).
Given a value, which three options can a developer use to detect if the value is NaN?
- A. Object.is(value, NaN)
- B. value !== value
- C. value == NaN
- D. value === Number.NaN
- E. Number.isNaN(value)
Correct Answer: A,B,E 🗳️
Explanation: Only visible for Exam-Killer members. You can sign-up / login (it's free).
A developer has a fizzbuzz function that, when passed in a number, returns the following:
'fizz' if the number is divisible by 3.
'buzz' if the number is divisible by 5.
'fizzbuzz' if the number is divisible by both 3 and 5.
Empty string '' if the number is divisible by neither 3 nor 5.
Which two test cases properly test scenarios for the fizzbuzz function?
- A. let res = fizzbuzz(true);
console.assert(res === ''); - B. let res = fizzbuzz(15);
console.assert(res === 'fizzbuzz'); - C. let res = fizzbuzz(5);
console.assert(res === 'fizz'); - D. let res = fizzbuzz(3);
console.assert(res === '');
Correct Answer: A,B 🗳️
Explanation: Only visible for Exam-Killer 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. Returns 5 ← (Text here appears to be a typo; correct value is 10, see explanation.)
- B. Returns 0
- C. Throws an error
- D. Returns NaN
Correct Answer: A 🗳️
Explanation: Only visible for Exam-Killer members. You can sign-up / login (it's free).
Refer to the code below (assuming Promise.race is intended):
let cat3 = new Promise(resolve =>
setTimeout(resolve, 3000, "Cat 3 completes")
);
Promise.race([cat1, cat2, cat3])
.then(value => {
let result = `${value} the race.`;
})
.catch(err => {
console.log("Race is cancelled:", err);
});
(Assuming cat1 and cat2 are similar to earlier examples: cat2 resolves fastest.) What is the value of result when Promise.race executes?
- A. Car 2 completed the race.
- B. Car 1 crashed on the race.
- C. Car 3 completed the race.
- D. Race is cancelled.
Correct Answer: A 🗳️
Explanation: Only visible for Exam-Killer members. You can sign-up / login (it's free).
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