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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q79-Q84):

NEW QUESTION # 79
A developer creates a simple webpage with an input field. When a user enters text in the input field and clicks the button, the actual value of the field must be displayed in the console.
Here is the HTML file content:
<input type =" text" value="Hello" name ="input">
<button type ="button" >Display </button>
The developer wrote the javascript code below:
Const button = document.querySelector('button');
button.addEvenListener('click', () => (
Const input = document.querySelector('input');
console.log(input.getAttribute('value'));
When the user clicks the button, the output is always "Hello".
What needs to be done make this code work as expected?

A. Replace line 04 with console.log(input .value);
B. Replace line 02 with button.addEventListener("onclick", function() {
C. Replace line 02 with button.addCallback("click", function() {
D. Replace line 03 with const input = document.getElementByName('input');

Answer: A

NEW QUESTION # 80
Refer to the following code block:

What is the value of output after the code executes?

A. 0
B. 1
C. 2
D. 3

Answer: A

NEW QUESTION # 81
Given the following code:
Let x =null;
console.log(typeof x);
What is the output of the line 02?

A. "Object"
B. "X"
C. "Null"
D. "undefined"

Answer: A

NEW QUESTION # 82
Universal Container(UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions that cause this problem. To verify this, the developer decides to do everything and log the time each of these three suspicious functions consumes.
console.time('Performance');
maybeAHeavyFunction();
thisCouldTakeTooLong();
orMaybeThisOne();
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.timeStamp()
C. console.timeLog()
D. console.trace()

Answer: C

NEW QUESTION # 83
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?

A. The url variable has global scope and line 02 throws an error.
B. The url variable has global scope and line 02 executes correctly.
C. The url variable has local scope and line 02 throws an error.
D. The url variable has local scope and line 02 executes correctly.

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 # 84
......

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