- Exam Code: JavaScript-Developer-I
- Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
- Updated: Oct 13, 2026
- Q & A: 149 Questions and Answers
Salesforce JavaScript-Developer-I actual dump : Salesforce Certified JavaScript Developer (JS-Dev-101)
PDF Version DemoAbout Salesforce JavaScript-Developer-I Exam Questions
As the old saying goes, learning never stops — and lifelong learning has become genuinely popular around the world. If the Salesforce Certified JavaScript Developer (JS-Dev-101) credential is your next lesson, Actual4Dumps prepares you for the JavaScript-Developer-I exam with 149 practice questions built around the official objectives.
Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Server-Side JavaScript | 8% | - Node.js fundamentals and runtime - Core Node.js modules - Command-line tools and scripts - Module system and require/import |
| Variables, Types, and Collections | 23% | - Variable declaration and initialization - Truthy and falsy values - Working with strings, numbers, dates, and booleans - JSON parsing and usage - Array methods and data manipulation - Type coercion and conversion rules |
| Debugging and Error Handling | 7% | - Debugging tools and breakpoints - Error types and exception handling - Defensive programming practices - Console methods and logging |
| Asynchronous Programming | 13% | - Event loop and micro/macro tasks - Promises and chaining - Callbacks and callback hell - Fetch API and HTTP requests - Async/await syntax |
| Objects, Functions, and Classes | 25% | - Modules and imports/exports - Function definitions, parameters, and scope - Closures and execution context - Object creation, properties, and methods - Decorators and advanced function patterns - Class syntax, inheritance, and prototypes |
| Testing | 7% | - Unit testing concepts - Testing frameworks and assertions - Test doubles and mocks - Code coverage and best practices |
| Browsers and Events | 17% | - Browser APIs and Web Storage - Script loading and execution order - Document Object Model (DOM) manipulation - Window and document object properties - Event handling, propagation, and delegation |
JavaScript-Developer-I Exam FAQ: Structure, Speed, and Facts
The JavaScript-Developer-I exam contains 60 scored + up to 5 unscored questions with 105 minutes minutes to complete them. A clear knowledge structure is what makes that volume manageable — you answer faster when every topic has its place.
Passing the JavaScript-Developer-I exam requires 65%, and registration costs USD 200 (+ applicable taxes). Structured preparation is how you spend study time once and exam fees once.
Immediately. The system emails you at once with the download link for the Salesforce Certified JavaScript Developer (JS-Dev-101) materials — the whole delivery process takes about a minute. Open the email, download the JavaScript-Developer-I exam product to your computer, install it, and you are studying within minutes of deciding to. If the message does not appear, check your spam folder; after 2 hours without delivery, contact support. Install on all of your own devices without limit.
No formal prerequisites; 1–2 years of JavaScript development experience recommended
The JavaScript-Developer-I exam is the official assessment behind the Salesforce Certified JavaScript Developer (JS-Dev-101) certification from Salesforce. Lifelong learning has become the norm precisely because industries keep moving — and this credential is a concrete way to keep pace. Many candidates only sit it seriously on a second attempt; structured preparation is how you make the first one count.
Salesforce recommends these training resources for candidates:
Official training adds depth; a clearly structured practice bank with verified answers adds direction. Together they cover both sides of preparation.
The official outline divides the JavaScript-Developer-I exam into weighted domains, including:
- Asynchronous Programming (13%)
- Objects, Functions, and Classes (25%)
- Testing (7%)
The Salesforce Certified JavaScript Developer (JS-Dev-101) bank at Actual4Dumps mirrors this structure, so the knowledge map you build while practicing matches the one the exam uses.
Registration for the JavaScript-Developer-I exam runs through these official channels:
It is never too late to start — but starting today beats starting after one more week of hesitation.
Structure is the design principle. The Salesforce Certified JavaScript Developer (JS-Dev-101) materials first build a clear knowledge structure of the JavaScript-Developer-I exam, so difficult points become understandable in sequence rather than intimidating in isolation. Our experts have prioritized the most important knowledge for busy learners, and every answer is expert-verified — so your limited hours go exactly where the objectives point.
Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions:
Question #1
Given the code below:
01 function Person() {
02 this.firstName = ' John ' ;
03 }
04
05 Person.proto = {
06 job: x = > ' Developer '
07 });
08
09 const myFather = new Person();
10 const result = myFather.firstName + ' ' + myFather.job();
What is the value of result when line 10 executes?
- A. undefined Developer
- B. John Developer
- C. Error: myFather.job is not a function
- D. John undefined
Correct Answer: C 🗳️
Explanation: Only visible for Actual4Dumps members. You can sign-up / login (it's free).
Question #2
Which two implementations of utils.js support foo and bar?
- A. const foo = () = > { return ' foo ' ; };
const bar = () = > { return ' bar ' ; };
export default { foo, bar }; - B. import { foo, bar } from " ./helpers/utils.js " ;
export { foo, bar }; - C. const foo = () = > { return ' foo ' ; };
const bar = () = > { return ' bar ' ; };
export { foo, bar }; - D. export default class {
foo() { return ' foo ' ; }
bar() { return ' bar ' ; }
}
Correct Answer: B,C 🗳️
Explanation: Only visible for Actual4Dumps members. You can sign-up / login (it's free).
Question #3
Refer to the following code block (with corrected template literals using backticks):
01 class Animal {
02 constructor(name) {
03 this.name = name;
04 }
05
06 makeSound() {
07 console.log(`${this.name} is making a sound.`);
08 }
09 }
10
11 class Dog extends Animal {
12 constructor(name) {
13 super(name);
14 this.name = name;
15 }
16 makeSound() {
17 console.log(`${this.name} is barking.`);
18 }
19 }
20
21 let myDog = new Dog( ' Puppy ' );
22 myDog.makeSound();
What is the console output?
- A. > Undefined
- B. > Uncaught ReferenceError
- C. > Puppy is barking.
Correct Answer: C 🗳️
Explanation: Only visible for Actual4Dumps members. You can sign-up / login (it's free).
Question #4
A page loads 50+ < div class= " ad-library-item " > elements, all ads.
Developer wants to quickly and temporarily remove them.
Options:
- A. Use the browser console to execute a script that prevents the load event from firing.
- B. Use the DOM inspector to remove all elements containing the class ad-library-item.
- C. Use the browser console to execute a script that removes all elements containing the class ad-library- item.
- D. Use the DOM inspector to prevent the load event from firing.
Correct Answer: C 🗳️
Explanation: Only visible for Actual4Dumps members. You can sign-up / login (it's free).
Question #5
Refer to the following object:
01 const cat = {
02 firstName: ' Fancy ' ,
03 lastName: ' Whiskers ' ,
04 get fullName(){
05 return this.firstName + ' ' + this.lastName;
06 }
07 };
How can a developer access the fullName property for cat?
- A. cat.get.fullName
- B. cat.fullName()
- C. cat.function.fullName()
- D. cat.fullName
Correct Answer: D 🗳️
Explanation: Only visible for Actual4Dumps members. You can sign-up / login (it's free).
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