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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q35-Q40):

NEW QUESTION # 35
Refer to the code below:

What is the value of foobDienu1 after the code executes?

Answer: B


NEW QUESTION # 36
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?

Answer: D

Explanation:
We call:
myFunction([]);
Inside:
arr.reduce((result, current) = > {
return result + current;
}, 10);
Key points about Array.prototype.reduce:
* Signature: array.reduce(callback, initialValue)
* If initialValue is provided and the array is empty , reduce:
* Does not call the callback at all.
* Simply returns initialValue.
Here:
* arr is [] (empty).
* initialValue is 10.
So:
* No iterations of the callback happen (no elements to process).
* The return value is the initial value: 10.
So the actual output is:
myFunction([]) === 10;
Among the options:
* A: 0 - incorrect, because the initial value is 10, not 0.
* B: Throws an error - reduce throws only if the array is empty and there is no initialValue. Here we have an initial value, so no error.
* C: NaN - there is no arithmetic with undefined or invalid values; we just return 10.
* D: Returns 5 - the numeric value given is wrong; the correct value is 10.
Given the logic, the correct conceptual result is 10 . The option text "Returns 5" is almost certainly a typo for "Returns 10". Since the letter that is intended to represent the correct behavior is D, we keep:
The answer: D
Study Guide / Concept References (no links):
* Array.prototype.reduce behavior with initialValue
* Behavior of reduce on an empty array with and without initialValue
* Return value when no iterations run


NEW QUESTION # 37
A developer has a server running with Node.js. the command to start the web server is node server.js. the server started having latency issues. Instead of a one second turnaround for web requests, the developer now sees a five second turnaround.
Which command can the web developer run to see what the module is doing during the latency period?

Answer: B


NEW QUESTION # 38
Refer to the code:

Given the code above, which three properties are set pet1?
Choose 3 answers:

Answer: A,B,C


NEW QUESTION # 39
Given the code below:
01 setCurrentUrl();
02 console.log( " The current URL is: " + url);
03
04 function setCurrentUrl() {
05 url = window.location.href;
06 }
What happens when the code executes?

Answer: B

Explanation:
* Inside setCurrentUrl, url is assigned without var, let, or const :
url = window.location.href;
* In non-strict mode, this implicitly creates a global variable url on window.
Execution order:
* setCurrentUrl(); creates/sets global url to window.location.href.
* console.log( " The current URL is: " + url); has access to url in global scope and prints correctly.
Thus:
* url has global scope.
* Line 02 runs without error and logs a valid string.
So B is correct.


NEW QUESTION # 40
......

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