Quiz 2026 Salesforce Trustable JS-Dev-101 Questions Answers

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Salesforce JS-Dev-101 Exam Syllabus Topics:

SectionObjectives
Topic 1: Salesforce Platform Integration- Lightning Web Components (LWC) Basics
- Working with Salesforce Data Models
Topic 2: Object-Oriented JavaScript- Objects and Prototypes
- Classes and Inheritance
Topic 3: Browser and DOM Interaction- DOM Manipulation
- Events and Event Handling
Topic 4: JavaScript Fundamentals- Control Flow and Error Handling
- Functions and Scope
- Variables, Data Types, and Operators
Topic 5: Asynchronous Programming- Callbacks, Promises, and Async/Await
- API Calls and Data Fetching

>> JS-Dev-101 Questions Answers <<

Pass Guaranteed Latest JS-Dev-101 - Salesforce Certified JavaScript Developer - Multiple Choice Questions Answers

The JS-Dev-101 PDF works on smart phones, tablets, and laptops. Windows computers support the JS-Dev-101 desktop practice test software. No software installation is necessary for the web-based Salesforce Exam practice exam. All operating systems (Mac, Linus, Android, iOS, Windows) and major browsers support the JS-Dev-101 web-based practice exam.

Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q38-Q43):

NEW QUESTION # 38
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.

Answer: C


NEW QUESTION # 39
A developer is debugging a web server that uses Node.js The server hits a runtimeerror every third request to an important endpoint on the web server.
The developer added a break point to the start script, that is at index.js at he root of the server's source code. The developer wants to make use of chrome DevTools to debug.
Which command can be run to access DevTools and make sure the breakdown is hit ?

Answer: A


NEW QUESTION # 40
A test has a dependency on database.query. During the test the dependency is replaced with an object called database with the method, query, that returns an array. The developer needs to verify how many times the method was called and the arguments used each time.
Which two test approaches describe the requirement?
Choose 2 answers

Answer: A,D


NEW QUESTION # 41
A class was written to represent items for purchase in an online store, and a second class representing items that are on sale at a discounted price. The constructor sets the name to the first value passed in. There is a new requirement for a developer to implement a description method that will return a brief description for Item and SaleItem.
01 let regItem = new Item('Scarf', 55);
02 let saleItem = new SaleItem('Shirt', 80, .1);
03 Item.prototype.description = function() { return 'This is a ' + this.name; }
04 console.log(regItem.description());
05 console.log(saleItem.description());
06
07 SaleItem.prototype.description = function() { return 'This is a discounted ' + this.name; } What is the output when executing the code above?

Answer: C

Explanation:
Comprehensive and Detailed
Assuming SaleItem inherits from Item via prototype (e.g. SaleItem.prototype = Object.create(Item.prototype)):
Lines 01-02: create regItem and saleItem.
Line 03: define Item.prototype.description.
Now both regItem and saleItem (via inheritance) have a description method from Item.prototype.
Line 04: regItem.description() → 'This is a Scarf'.
Line 05: saleItem.description() → 'This is a Shirt' (same method, but this.name is 'Shirt').
Line 07: SaleItem.prototype.description = ... overrides description only for SaleItem instances going forward.
If we imagine calling regItem.description() and saleItem.description() again after line 07:
regItem.description() still uses Item.prototype.description → 'This is a Scarf'.
saleItem.description() now uses SaleItem.prototype.description → 'This is a discounted Shirt'.
Those four lines correspond to option B.
________________________________________


NEW QUESTION # 42
Refer to the following code:
```html
<html lang="en">
<body>
<button class="secondary">Save draft</button>
<button class="primary">Save and close</button>
</body>
<script>
function displaySaveMessage(event) {
console.log('Save message.');
}
function displaySuccessMessage(event) {
console.log('Success message.');
}
window.onload = function() {
document.querySelector('.secondary')
.addEventListener('click', displaySaveMessage, true);
document.querySelector('.primary')
.addEventListener('click', displaySuccessMessage, true);
}
</script>
</html>

Answer: A


NEW QUESTION # 43
......

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