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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q66-Q71):

NEW QUESTION # 66
What is the result of the code block?

A. The console logs 'flag' and another flag.
B. The console logs 'flag' and then an error is thrown.
C. The console logs only 'flag'.
D. An error is thrown.

Answer: C

NEW QUESTION # 67
Universal Containers recently launched its new landing page to host a crowd-funding campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, it creates more than 50 new HTML items placed randomly insidethe DOM, like the one in the code below:

All the elements includes the same ad-library-item class, They are hidden by default, and they are randomly displayed while the user navigates through the page.

A. Use the browser console to execute a scriptthat prevents the load event to be fired.
B. Use the DOM inspector to remove all the elements containing the class ad-library-item.
C. Use the browser to execute a script that removes all the element containing the class ad-library-item.
D. Use the DOM inspector to prevent the load eventto be fired.

Answer: C

NEW QUESTION # 68
A developer needs to test this function:
01 const sum3 = (arr) => (
02 if (!arr.length) return 0,
03 if (arr.length === 1) return arr[0],
04 if (arr.length === 2) return arr[0] + arr[1],
05 return arr[0] + arr[1] + arr[2],
06 );
Which two assert statements are valid tests for the function?
Choose 2 answers

A. console.assert(sum3(0)) == 0);
B. console.assert(sum3(1, '2')) == 12);
C. console.assert(sum3('hello', 2, 3, 4)) === NaN);
D. console.assert(sum3(-3, 2 )) == -1);

Answer: B,D

NEW QUESTION # 69
Given the JavaScript below:
01 function filterDOM(searchString){
02 const parsedSearchString = searchString & & searchString.toLowerCase();
03 document.querySelectorAll( ' .account ' ).forEach(account = > {
04 const accountName = account.innerHTML.toLowerCase();
05 account.style.display = accountName.includes(parsedSearchString) ? /* Insert code here */;
06 });
07 }
Which code should replace the placeholder comment on line 05 to hide accounts that do not match the search string?

A. ' none ' : ' block '
B. ' block ' : ' none '
C. ' visible ' : ' hidden '
D. ' hidden ' : ' visible '

Answer: B

Explanation:
We have a ternary:
account.style.display = accountName.includes(parsedSearchString)
? /* if true */
/* if false */;
Requirement:
* If the account matches the search string # show it.
* If it does not match # hide it.
For display:
* Show: ' block ' (or similar visible value).
* Hide: ' none ' .
So we want:
account.style.display = accountName.includes(parsedSearchString)
? ' block '
' none ' ;
That corresponds to option A.
Why others are wrong:
* B, C use values suitable for visibility, not display.
* D ( ' none ' : ' block ' ) inverts the logic, hiding matches and showing non-matches.

NEW QUESTION # 70
Refer to the code declarations below:

Which three expressions return the string JavaScript?
Choose 3 answers

A. Str1.join (str2);
B. Str1.concat (str2);
C. $(str1) $ (str2} ';
D. Str1 + str2;
E. Concat (str1, str2);

Answer: B,C,D

NEW QUESTION # 71
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