- Exam Code: JS-Dev-101
- Exam Name: Salesforce Certified JavaScript Developer - Multiple Choice
- Updated: Oct 13, 2026
- Q & A: 149 Questions and Answers
Salesforce JS-Dev-101 Exam : Salesforce Certified JavaScript Developer - Multiple Choice
PDF Version DemoAbout Salesforce JS-Dev-101 Exam
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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
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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions:
Question #1
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(15);
console.assert(res === 'fizzbuzz'); - B. let res = fizzbuzz(3);
console.assert(res === ''); - C. let res = fizzbuzz(true);
console.assert(res === ''); - D. let res = fizzbuzz(5);
console.assert(res === 'fizz');
Correct Answer: A,C 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
Question #2
Refer to the code below:
01 const objBook = {
02 title: 'JavaScript',
03 };
04 Object.preventExtensions(objBook);
05 const newObjBook = objBook;
06 newObjBook.author = 'Robert';
What are the values of objBook and newObjBook respectively?
- A. { title: "JavaScript" }
{ title: "JavaScript" } - B. { author: "Robert" }
{ author: "Robert", title: "JavaScript" } - C. { author: "Robert", title: "JavaScript" }
{ author: "Robert", title: "JavaScript" } - D. { author: "Robert", title: "JavaScript" }
undefined
Correct Answer: A 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
Question #3
Given the following code:
01 counter = 0;
02 const logCounter = () => {
03 console.log(counter);
04 };
05 logCounter();
06 setTimeout(logCounter, 2100);
07 setInterval(() => {
08 counter++;
09 logCounter();
10 }, 1000);
What will be the first four numbers logged?
- A. 0122
- B. 0123
- C. 0012
- D. 0112
Correct Answer: A 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
Question #4
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();
- B. server.on('connect', (port) => { console.log('Listening on', port); });
- C. server((port) => { console.log('Listening on', port); });
- D. server.start();
Correct Answer: C 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
Question #5
Refer to the code below:
01 let sayHello = () => {
02 console.log('Hello, World!');
03 };
Which code executes sayHello once, two minutes from now?
- A. setInterval(sayHello, 120000);
- B. setTimeout(sayHello(), 120000);
- C. setTimeout(sayHello, 120000);
- D. delay(sayHello, 120000);
Correct Answer: C 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
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