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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 Certified JavaScript Developer - Multiple Choice Sample Questions:
Refer to the code:
01 let car1 = new Promise((_, reject) =>
02 setTimeout(reject, 2000, "Car 1 crashed in"));
03 let car2 = new Promise(resolve =>
04 setTimeout(resolve, 1500, "Car 2 completed"));
05 let car3 = new Promise(resolve =>
06 setTimeout(resolve, 3000, "Car 3 completed"));
07
08 Promise.race([car1, car2, car3])
09 .then(value => {
10 let result = '$(value) the race.';
11 })
12 .catch(err => {
13 console.log("Race is cancelled.", err);
14 });
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).
function myFunction() {
a = a + b;
var b = 1;
}
myFunction();
console.log(a);
console.log(b);
Which statement is correct?
- A. Both line 02 and 03 are executed, and the variables are hoisted.
- B. Line 02 throws a reference error, therefore line 03 is never executed.
- C. Both line 02 and 03 are executed, but the values printed are undefined.
- D. Line 08 outputs the variable, but line 09 throws an error.
Correct Answer: B 🗳️
Explanation: Only visible for BraindumpsIT 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 NaN
- B. Throws an error
- C. Returns 5 ← (Text here appears to be a typo; correct value is 10, see explanation.)
- D. Returns 0
Correct Answer: C 🗳️
Explanation: Only visible for BraindumpsIT members. You can sign-up / login (it's free).
A developer at Universal Containers creates a new landing page based on HTML, CSS, and JavaScript.
To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed to do some custom initialization when the webpage is fully loaded with HTML content and all related files.
Which statement should be used to call personalizeWebsiteContent based on the above business requirement?
- A. document.addEventListener('DOMContentLoaded', personalizeWebsiteContent);
- B. window.addEventListener('load', personalizeWebsiteContent);
- C. window.addEventListener('onload', personalizeWebsiteContent);
- D. document.addEventListener('onDOMContentLoaded', personalizeWebsiteContent);
Correct Answer: B 🗳️
Explanation: Only visible for BraindumpsIT members. You can sign-up / login (it's free).
A developer publishes a new version of a package with new features that do not break backward compatibility. The previous version number was 1.1.3.
Following semantic versioning formats, what should the new package version number be?
- A. 1.2.3
- B. 1.2.0
- C. 1.1.4
- D. 2.0.0
Correct Answer: B 🗳️
Explanation: Only visible for BraindumpsIT members. You can sign-up / login (it's free).
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