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Last Updated: Oct 21, 2026
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Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions:
Refer to the code:
01 const exec = (item, delay) =>
02 new Promise(resolve => setTimeout(() => resolve(item), delay));
03
04 async function runParallel() {
05 const [result1, result2, result3] = await Promise.all(
06 [exec('x', '100'), exec('y', '500'), exec('z', '100')]
07 );
08 return `parallel is done: ${result1}${result2}${result3}`;
09 }
Which two statements correctly execute runParallel()?
- A. runParallel().then(data);
- B. async runParallel().then(data);
- C. runParallel().then(function(data){
return data;
}); - D. runParallel().done(function(data){
return data;
});
Correct Answer: A,C 🗳️
Explanation: Only visible for Easy4Engine members. You can sign-up / login (it's free).
A developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality. The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Which code logs an error at boot time with an event?
- A. server.catch((error) => {
console.log('ERROR', error);
}); - B. server.error((error) => {
console.log('ERROR', error);
}); - C. server.on('error', (error) => {
console.log('ERROR', error);
}); - D. try {
server.start();
} catch(error) {
console.log('ERROR', error);
}
Correct Answer: C 🗳️
Explanation: Only visible for Easy4Engine members. You can sign-up / login (it's free).
Refer to the code below:
01 let o = {
02 get js() {
03 let city1 = String('St. Louis');
04 let city2 = String('New York');
05
06 return {
07 firstCity: city1.toLowerCase(),
08 secondCity: city2.toLowerCase(),
09 }
10 }
11 }
What value can a developer expect when referencing o.js.secondCity?
- A. 'New York'
- B. An error
- C. 'new york'
- D. undefined
Correct Answer: C 🗳️
Explanation: Only visible for Easy4Engine members. You can sign-up / login (it's free).
Code:
01 let array = [1, 2, 3, 4, 4, 5, 4, 4];
02 for (let i = 0; i < array.length; i++) {
03 if (array[i] === 4) {
04 array.splice(i, 1);
05 i--;
06 }
07 }
What is the value of array after execution?
- A. [1,2,3,5]
- B. [1,2,3,4,5,4]
- C. [1,2,3,4,4,5,4]
- D. [1,2,3,4,5,4,4]
Correct Answer: A 🗳️
Explanation: Only visible for Easy4Engine members. You can sign-up / login (it's free).
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. 0012
- B. 0123
- C. 0112
- D. 0122
Correct Answer: D 🗳️
Explanation: Only visible for Easy4Engine members. You can sign-up / login (it's free).
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