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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q89-Q94):

NEW QUESTION # 89
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 }
08 getNextValue();
B. 03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 } then {
08 getNextValue();
09 }
C. 03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 } finally {
08 getNextValue();
09 }
D. 03 try {
04 handleObjectValue(x);
05 getNextValue();
06 } catch(error) {
07 handleError(error);
08 }

Answer: D

Explanation:
Requirement:
* getNextValue() should run only if handleObjectValue(x) does not throw an error.
* If an error occurs, handleError(error) should run, and getNextValue() should be skipped.
Option B:
try {
handleObjectValue(x);
getNextValue();
} catch (error) {
handleError(error);
}
Behavior:
* If handleObjectValue(x) succeeds (no error):
* Execution continues to getNextValue();.
* If handleObjectValue(x) throws:
* Control jumps directly to catch, getNextValue() is skipped.
* handleError(error); is called.
This matches the requirement perfectly.
Why others are incorrect:
* A: } then { is invalid JavaScript syntax.
* C:
try {
handleObjectValue(x);
} catch (error) {
handleError(error);
}
getNextValue();
* getNextValue() is called after the try...catch regardless of whether an error occurred. Not acceptable.
* D: finally always runs:
try {
handleObjectValue(x);
} catch (error) {
handleError(error);
} finally {
getNextValue();
}
* getNextValue() will execute in both success and error cases.
Therefore, the correct approach is B.
Concepts: try/catch control flow, finally semantics, placing code inside vs outside try/catch blocks.

NEW QUESTION # 90
Universal Containers (UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions any 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.
Which function can the developer use to obtain the time spent by every one of the three functions?

A. console.timeStamp ()
B. console.trace()
C. console. timeLog ()
D. console.getTime ()

Answer: C

NEW QUESTION # 91
Refer to the code below:
const event = new CustomEvent(
//Missing Code
);
obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options could a developer insert at the placeholder in line 02 to achieve this?
Choose 2 answers

A. 'Update' , {
Details : {
recordId : '123abc'
B. 'Update' , (
recordId : '123abc'
(
C. 'Update' , '123abc'
D. { type : 'update', recordId : '123abc' }

Answer: A,B

Explanation:
}
}

NEW QUESTION # 92
A developer has the following array of student test grades:
Let arr - [7, 8, 5, 9]
How should want to double each score and then see an array of the students who scored more than 15 points.
How should the developer implement the request?

A. Let arr1 = arr.mapBy ((num) => return num + 2 )) .filterBy ((val) => ( return val > 15 )) ;
B. Let arr1 = arr.map ((num) => num + 2 .filter ((val) => val 15 );
C. Let arr1 = arr .map ((num => ( num + 2 )) .filterBy ((val => ( val 15 )) ;
D. Let arr1 = arr .filter ((filter ((val) => ( return val > 15 )) .map (( num => ( return num +2 ));

Answer: B

NEW QUESTION # 93
Which three actions can be done using the JavaSript browser console?
Choose 3 answer

A. View and change security cookies
B. View and change the DOM of the page.
C. Run code a that is not related to the page.
D. View, change, and debug the JavaScript code of the page.
E. Display a report showing the performance of a page.

Answer: B,C,D

NEW QUESTION # 94
......

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