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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:
A developer writes the code below to return a message to a user attempting to register a new username. If the username is available, a variable named msg is declared and assigned a value on line 03.
function getAvailabilityMessage(item) {
if (getAvailability(item)) {
var msg = "Username available";
return msg;
}
}
- A. "newUserName"
- B. undefined
- C. "Username available"
- D. "msg is not defined"
Correct Answer: C 🗳️
Explanation: Only visible for BraindumpsIT members. You can sign-up / login (it's free).
Refer to the code below (corrected to use a template literal on line 08):
01 let car1 = new Promise((_, reject) =>
02 setTimeout(reject, 2000, "Car 1 crashed in")
03 );
04 let car2 = new Promise(resolve =>
05 setTimeout(resolve, 1500, "Car 2 completed")
06 );
07 let car3 = new Promise(resolve =>
08 setTimeout(resolve, 3000, "Car 3 completed")
09 );
10
11 Promise.race([car1, car2, car3])
12 .then(value => {
13 let result = `${value} the race.`;
14 })
15 .catch(err => {
16 console.log("Race is cancelled.", err);
17 });
What is the value of result when Promise.race executes?
- A. Car 1 crashed in the race.
- B. Race is cancelled.
- C. Car 2 completed the race.
- D. Car 3 completed the race.
Correct Answer: C 🗳️
Explanation: Only visible for BraindumpsIT members. You can sign-up / login (it's free).
After user acceptance testing, the developer is asked to change the webpage background based on the user's location. It works on the developer's computer but not on the tester's machine.
Which two actions will help determine accurate results?
- A. The tester should disable their browser cache.
- B. The developer should inspect their browser refresh settings.
- C. The developer should rework the code.
- D. The tester should clear their browser cache.
Correct Answer: A,D 🗳️
Explanation: Only visible for BraindumpsIT members. You can sign-up / login (it's free).
A developer needs to debug a Node.js web server because a runtime error keeps occurring at one of the endpoints.
The developer wants to test the endpoint on a local machine and make the request against a local server to look at the behavior. In the source code, the server.js file will start the server. The developer wants to debug the Node.js server only using the terminal.
Which command can the developer use to open the CLI debugger in their current terminal window?
(With corrected typing errors: node_inspect → node inspect, node_start_inspect → node start inspect.)
- A. node -i server.js
- B. node start inspect server.js
- C. node server.js --inspect
- D. node inspect server.js
Correct Answer: D 🗳️
Explanation: Only visible for BraindumpsIT members. You can sign-up / login (it's free).
Refer to the code below:
let strNumber = '12345';
Which code snippet shows a correct way to convert this string to an integer?
- A. let numberValue = Integer(strNumber);
- B. let numberValue = Number(strNumber);
- C. let numberValue = textValue.toInteger();
- D. let numberValue = (number) textValue;
Correct Answer: B 🗳️
Explanation: Only visible for BraindumpsIT members. You can sign-up / login (it's free).
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