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Latest Salesforce Certified JavaScript Developer Exam Practice Questions

The practice questions for Salesforce Certified JavaScript Developer exam was last updated on 2026-02-24 .

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Question#1

developer is trying to convince management that their team will benefit from using
Node.js for a backend server that they are going to create. The server will be a web server that handles API requests from a website that the teamhas already built using HTML, CSS, and JavaScript.
Which three benefits of Node.js can the developer use to persuade their manager? Choose 3 answers:

A. Installs with its own package manager to install and manage third-party libraries.

B. Ensures stability with one major release every few years.

C. Performs a static analysis on code before execution to look for runtime errors.

D. Executes server-side JavaScript code to avoid learning a new language.

E. Uses non-blocking functionality for performant requesthandling .

Question#2

Refer to the followingcode:
class Vehicle{
constructor(plate){
this.plate = plate;
}
}
class Truck extends Vehicle{
constructor(plate, weight){
//Missing code
this.weight = weight;
}
displayWeight(){
console.log(`The truck ${this.plate} has a weight of ${this.weight}lb.`);
}
}let myTruck = new Truck('123Ab',5000);
myTruck.displayWeight();
Which statement should be added to missing code for the code to display 'The truck 123AB has a weight of 5000lb.

A. super(plate)

B. super.plate = plate

C. Vehicle.plate = plate

D. this.plate= plate

Question#3

Refer to the following array:
Let arr = [1, 2, 3, 4, 5];
Which three options result in x evaluating as [1,2]? Choose 3 answer

A. let x = arr. slice (2);

B. let x = arr. slice (0, 2);

C. let x arr.filter((a) => (return a <= 2 });

D. let x = arr.filter ((a) => 2 }) ;

E. let x =arr.splice(0, 2);

Question#4

Refer to the HTML below:

Which JavaScript statement results in changing “ The Lion.”?

A. document.querySelectorAll(‘$main $TONY’).innerHTML = ’“ The Lion

B. document.querySelector(‘$main li:second-child’).innerHTML = “The Lion ’;

C. document.querySelector(‘$main li.Tony’).innerHTML = ’“ The Lion ’;

D. document.querySelector(‘$main li:nth-child(2)’),innerHTML = “ The Lion. ’;

Question#5

A developer wrote a fizzbuzz function that when passed in a number, returns the following:
● ‘Fizz’ if the number is divisible by 3.
● ‘Buzz’ if the number is divisible by 5.
● ‘Fizzbuzz’ if the number is divisible by both 3 and 5.
● Empty string if the number is divisible by neither 3 or 5.
Which two test cases will properly test scenarios for the fizzbuzz function? Choose 2 answers

A. let res = fizzbuzz(5);console.assert (res === ‘ ’ );

B. let res = fizzbuzz(15);console.assert (res === ‘ fizzbuzz ’ )

C. let res = fizzbuzz(Infinity);console.assert (res === ‘ ’ )

D. let res = fizzbuzz(3);console.assert (res === ‘ buzz ’ )

Disclaimer

This page is for educational and exam preparation reference only. It is not affiliated with Salesforce, Salesforce Developer, or the official exam provider. Candidates should refer to official documentation and training for authoritative information.

Exam Code: Salesforce Certified JavaScript DeveloperQ & A: 230 Q&AsUpdated: 2026-02-24

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