Salesforce JS-Dev-101 Exam Syllabus Topics:
| Topic | Details |
|---|---|
| Topic 1 |
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| Topic 2 |
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| Topic 3 |
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| Topic 4 |
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| Topic 5 |
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| Topic 6 |
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Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions:
Question #1
A developer wrote the following code:
01 let x = object.value;
02
03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 }
The developer has a getNextValue function to execute after handleObjectValue(), but does not want to execute getNextValue() if an error occurs. How can the developer change the code to ensure this behavior?
A. 03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 } then {
08 getNextValue();
09 }
B. 03 try {
04 handleObjectValue(x);
05 getNextValue();
06 } catch(error) {
07 handleError(error);
08 }
C. 03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 }
08 getNextValue();
D. 03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 } finally {
08 getNextValue();
09 }
Question #2
Refer to the HTML below:
<div id="main">
<ul>
<li>Leo</li>
<li>Tony</li>
<li>Tiger</li>
</ul>
</div>
Which JavaScript statement results in changing "Leo" to "The Lion"?
A. document.querySelector('#main li:second-child').innerHTML = 'The Lion';
B. document.querySelector('#main li:nth-child(1)').innerHTML = 'The Lion';
C. document.querySelectorAll('#main #Leo').innerHTML = 'The Lion';
D. document.querySelectorAll('#main li,Leo').innerHTML = 'The Lion';
Question #3
Given the code below:
let numValue = 1982;
Which three code segments result in a correct conversion from number to string?
A. let strValue = '' + numValue;
B. let strValue = String(numValue);
C. let strValue = numValue.toText();
D. let strValue = numValue.toString();
E. let strValue = (String)numValue;
Question #4
Universal Containers (UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions that might cause this problem. To verify this, the developer decides to execute everything and log the time each of these three suspicious functions consumes.
01 console.time('Performance');
02
03 maybeAHeavyFunction();
04
05 thisCouldTakeTooLong();
06
07 orMaybeThisOne();
08
09 console.endTime('Performance');
Which function can the developer use to obtain the time spent by every one of the three functions?
A. console.getTime()
B. console.timeLog()
C. console.timeStamp()
D. console.trace()
Question #5
Given a value, which three options can a developer use to detect if the value is NaN?
A. value === Number.NaN
B. value !== value
C. Object.is(value, NaN)
D. Number.isNaN(value)
E. value == NaN
Solutions:
| Question #1 Correct Answer: B | Question #2 Correct Answer: B | Question #3 Correct Answer: A,B,D | Question #4 Correct Answer: B | Question #5 Correct Answer: B,C,D |
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