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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Objects, Functions, and Classes: Covers function, object, and class implementations to meet business requirements, along with the use of modules, decorators, variable scope, and execution flow.
Topic 2	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 3	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Topic 4	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q27-Q32):

NEW QUESTION # 27
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
- Will establish a web socket connection and handle receipt of messages to the server
- Will be imported with `require`, and made available with a variable called `ws`.
The developer also wants to add error logging if a connection fails.
Given this information, which code segment shows the correct way to set up a client with two events that listen at execution time?

A. ws.connect(() => {
console.log('Connected to client');
}).catch((error) => {
console.log('ERROR', error);
});
B. ws.on('connect', () => {
console.log('Connected to client');
});
ws.on('error', (error) => {
console.log('ERROR', error);
});
C. try {
ws.connect(() => {
console.log('Connected to client');
});
} catch(error) {
console.log('ERROR', error);
D. ws.on('connect', () => {
console.log('Connected to client');
});
ws.on('error', (error) => {
console.log('ERROR', error);
});

Answer: B,D

Explanation:
}

NEW QUESTION # 28
Refer to the code below:
<html>
<body>
<div id="logo">Hello Logo!</div>
<button id="test">Click me</button>
</body>
<script>
function printMessage(event) {
console.log('This is a test message');
}
let el = document.getElementById('test');
el.addEventListener("click", printMessage, false);
</script>
</html>
Which action should be done?

A. Add event.stopPropagation(); to printMessage function
B. Add event.removeEventListener(); to printMessage function
C. Add event.stopPropagation(); to window.onload event handler
D. Add event.removeEventListener(); to window.onload event handler

Answer: A

Explanation:
The correct answer is C.
The typing errors in the options should be corrected as follows:
event.stopPropagation();
The stopPropagation() method is used to stop an event from continuing through the DOM event propagation path.
A click event normally goes through these phases:
Capturing phase → Target phase → Bubbling phase
Because the event listener is attached to the button:
el.addEventListener("click", printMessage, false);
the function printMessage receives the click event when the button is clicked. To stop the event from bubbling up to parent elements, the event object should be accepted as a parameter and stopPropagation() should be called inside the event handler.
Corrected code:
<html>
<body>
<div id="logo">Hello Logo!</div>
<button id="test">Click me</button>
</body>
<script>
function printMessage(event) {
event.stopPropagation();
console.log('This is a test message');
}
let el = document.getElementById('test');
el.addEventListener("click", printMessage, false);
</script>
</html>
Why this is correct:
event.stopPropagation();
prevents the click event from moving upward to ancestor elements after the button's handler runs.
Why the other options are incorrect:
A and B are incorrect because removeEventListener() is used to remove a previously registered event listener. It does not stop event bubbling for the current event.
D is incorrect because stopPropagation() should be called inside the active event handler that receives the event object. In this case, that function is:
printMessage(event)
Therefore, the verified answer is C.

NEW QUESTION # 29
A developer is asked to fix some bugs reported by users. To do that, the developer adds abreakpoint for debugging.
Function Car (maxSpeed, color){
This.maxspeed =masSpeed;
This.color = color;
Let carSpeed = document.getElementById(' CarSpeed');
Debugger;
Let fourWheels =new Car (carSpeed.value, 'red');
When the code execution stops at the breakpoint on line 06, which two types of information are available in the browser console ?
Choose 2 answers:

A. The style, event listeners and other attributes applied to the carSpeed DOM element
B. The information stored in the window.localStorage property
C. A variable displaying the number of instances created for the Car Object.
D. The values of the carSpeed and fourWheels variables

Answer: A,B

NEW QUESTION # 30
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. Vehicle.plate = plate
C. super.plate = plate
D. this.plate= plate

Answer: A

NEW QUESTION # 31
What are two unique features of fat-arrow functions compared to normal function definitions?

A. The function generates its own this making it useful for separating scope.
B. The function uses the this from the enclosing scope.
C. If the function has a single expression in the function body, the expression will be evaluated and implicitly returned.
D. The function receives an argument called parentThis, giving the enclosing lexical scope.

Answer: B,C

Explanation:
Arrow functions have two defining characteristics:
Implicit return when written as a single expression:
const fn = () => 5; // returns 5 automatically
This is unique to arrow functions → A is correct.
Lexical this binding:
Arrow functions do not create their own this.
Instead, they use the this value from the surrounding scope → B is correct.
Incorrect options:
C is false: There is no special argument called parentThis.
D is the opposite of arrow function behavior:
Normal functions create their own this; arrow functions do not.
JavaScript Knowledge Reference (text-only)
Arrow functions have lexical this binding.
Arrow functions support implicit return for single expressions.

NEW QUESTION # 32
......

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