JAVASCRIPT-DEVELOPER-I Exam Questions and Answers

QUESTION: 36

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

"Null"
"X"
"Object"
"undefined"

Answer(s): C

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QUESTION: 37

Which function should a developer use to repeatedly execute code at a fixed interval ?

setIntervel
setTimeout
setPeriod
setInteria

Answer(s): A

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Refer to the code below:
Function changeValue(obj) {
Obj.value = obj.value/2;
}
Const objA = (value: 10);
Const objB = objA;
changeValue(objB);
Const result = objA.value;

What is the value of result after the code executes?

10
Nan
5
Undefined

Answer(s): C

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QUESTION: 39

Given HTML below:
<div>
<div id ="row-uc"> UniversalContainer</div>
<div id ="row-aa">Applied Shipping</div>
<div id ="row-bt"> Burlington Textiles </div>
</div>
Which statement adds the priority = account CSS class to the universal Containers row ?

Document .querySelector(`#row-uc').classes.push(`priority-account');
Document .queryElementById(`row-uc').addclass(`priority-account');
Document .querySelector(`#row-uc').classList.add(`priority-account');
Document .querySelectorALL(`#row-uc').classList.add(`priority-account');

Answer(s): B

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QUESTION: 40

GIven a value, which three options can a developer use to detect if thevalue is NaN? Choose 3 answers !

value == NaN
Object.is(value, NaN)
value === Number.NaN
value ! == value
Number.isNaN(value)

Answer(s): A,E

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Salesforce JAVASCRIPT-DEVELOPER-I Exam (page: 8)
Salesforce Certified JavaScript Developer I
Updated on: 25-Dec-2025

QUESTION: 36

QUESTION: 37

QUESTION: 38

QUESTION: 39

QUESTION: 40

Salesforce JAVASCRIPT-DEVELOPER-I Exam (page: 8) Salesforce Certified JavaScript Developer I Updated on: 25-Dec-2025

QUESTION: 36

QUESTION: 37

QUESTION: 38

QUESTION: 39

QUESTION: 40

Salesforce JAVASCRIPT-DEVELOPER-I Exam (page: 8)
Salesforce Certified JavaScript Developer I
Updated on: 25-Dec-2025