Free PDF 2026 Accurate JavaScript-Developer-I: Salesforce Certified JavaScript Developer (JS-Dev-101) Certified

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Salesforce JavaScript-Developer-I Exam Overview:

Certification Vendor:	Salesforce
Exam Name:	Salesforce Certified JavaScript Developer I
Exam Number:	JS-Dev-101
Passing Score:	65%
Exam Price:	$200 USD
Exam Duration:	105 minutes
Exam Format:	Multiple-select, Multiple-choice
Available Languages:	English
Related Certifications:	Salesforce Certified JavaScript Developer I Credential
Real Exam Qty:	60 (plus up to 5 unscored pilot questions)
Certificate Validity Period:	None (Credential does not expire)
Sample Questions:	Salesforce JavaScript-Developer-I Sample Questions
Exam Way:	Online (proctored via Pearson VUE) or On-site (at a Pearson VUE testing center)
Pre Condition:	None required. 1-2 years of JavaScript development experience (front-end and/or back-end) is strongly recommended. Note: To earn the full credential, candidates must also pass the Lightning Web Components Specialist Superbadge in addition to the JS-Dev-101 exam.
Official Syllabus URL:	https://trailhead.salesforce.com/en/credentials/javascriptdeveloperi

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To become a Salesforce Certified JavaScript Developer I, candidates must pass the JavaScript-Developer-I Exam. JavaScript-Developer-I exam consists of 60 multiple-choice questions, and candidates have 105 minutes to complete the test. The passing score for the exam is 68%, and the test is available in multiple languages.

Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q28-Q33):

NEW QUESTION # 28
Referto the following code:

Which two statement could be inserted at line 17 to enable the function call on line 18?
Choose 2 answers

A. Object.assign (leo, tony);
B. leo.prototype.roar = ( ) =>( console.log('They\'re pretty good!'); };
C. Object.assign (leo. Tiger);
D. leo.roar = () => { console.log('They\'re pretty good!'); );

Answer: A,D

NEW QUESTION # 29
Refer to the code below:

Which replacement for the conditionalstatement on line 02 allows a developer to correctly determine that a specific element, myElement on the page had been clicked?

Answer:

Explanation:
event.target.id =='myElement'

NEW QUESTION # 30
GIven a value, which three options can a developer use to detect if the value is NaN?
Choose 3 answers !

A. value == NaN
B. value ! == value
C. Number.isNaN(value)
D. value === Number.NaN
E. Object.is(value, NaN)

Answer: A,C

NEW QUESTION # 31
developer publishes a new version of a package with new features that do not break
backward compatibility. The previous version number was 1.1.3.
Following semantic versioning format, what should the new package version number
be?

A. 2.0.0
B. 1.2.0
C. 1.1.4
D. 1.2.3

Answer: B

NEW QUESTION # 32
Refer to the code below:
01 let sayHello = () = > {
02 console.log( ' Hello, World! ' );
03 };
Which code executes sayHello once , two minutes from now?

A. setTimeout(sayHello, 120000);
B. delay(sayHello, 120000);
C. setTimeout(sayHello(), 120000);
D. setInterval(sayHello, 120000);

Answer: A

Explanation:
To schedule a function for later execution in JavaScript, the standard built-in method is:
setTimeout(functionReference, delayInMilliseconds)
Characteristics of setTimeout():
* Executes only once .
* Delay is specified in milliseconds.
* Requires passing the function reference , not calling the function.
Two minutes is:
2 minutes = 120 seconds = 120,000 milliseconds
Now evaluate each option:
Option A: delay(sayHello, 120000);
Incorrect.
There is no built-in delay() function in JavaScript.
Option B: setTimeout(sayHello, 120000);
Correct.
sayHello is passed as a function reference , so it will execute once after 120,000 ms.
Option C: setTimeout(sayHello(), 120000);
Incorrect.
sayHello() calls the function immediately , and the return value (undefined) is passed to setTimeout.
This executes the function right away instead of after two minutes.
Option D: setInterval(sayHello, 120000);
Incorrect.
setInterval() repeats execution every 120,000 ms.
The question requires executing the function once , so this cannot be correct.
JavaScript Knowledge References (text-only)
* setTimeout() schedules a function to run once after a specified delay.
* Passing functionName gives a reference; passing functionName() invokes it immediately.
* setInterval() repeats indefinitely, unlike setTimeout().

NEW QUESTION # 33
......

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