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JavaScript-Developer-I Salesforce Certified JavaScript Developer (JS-Dev-101) Free Practice Exam Questions (2025 Updated)

Prepare effectively for your Salesforce JavaScript-Developer-I Salesforce Certified JavaScript Developer (JS-Dev-101) certification with our extensive collection of free, high-quality practice questions. Each question is designed to mirror the actual exam format and objectives, complete with comprehensive answers and detailed explanations. Our materials are regularly updated for 2025, ensuring you have the most current resources to build confidence and succeed on your first attempt.

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Total 219 questions

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.

Object.assign (leo. Tiger);

C.

leo.roar = () => { console.log('They\'re pretty good!'); );

D.

leo.prototype.roar = ( ) =>( console.log('They\'re pretty good!'); };

A developer wants to define a function log to be used a few times on a single-file JavaScript script.

01 // Line 1 replacement

02 console.log('"LOG:', logInput);

03 }

Which two options can correctly replaceline 01 and declare the function for use?

Choose 2 answers

A.

function leg(logInput) {

B.

const log(loginInput) {

C.

const log = (logInput) => {

D.

function log = (logInput) {

Refer to the code below:

What is the value of result when the code executes?

A.

10-10

B.

5-5

C.

10-5

D.

5-10

Refer to the following object.

How can a developer access the fullName property for dog?

A.

Dog.fullName

B.

Dog.fullName ( )

C.

Dog, get,fullName

D.

Dog, function, fullName

A developer implements a function that adds a few values.

Function sum(num) {

If (num == undefined) {

Num =0;

}

Return function( num2, num3){

If (num3 ===undefined) {

Num3 =0 ;

}

Return num + num2 + num3;

}

}

Which three options can the developer invoke for this function to get a return value of 10 ?

Choose 3 answers

A.

Sum () (20)

B.

Sum (5, 5) ()

C.

sum() (5, 5)

D.

sum(5)(5)

E.

sum(10) ()

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Total 219 questions
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