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Salesforce JavaScript-Developer-I Exam is a certification for JavaScript developers who specialize in building custom applications on the Salesforce platform. JavaScript-Developer-I exam is designed to test a candidate's knowledge of JavaScript programming concepts, as well as their ability to develop custom applications using the Salesforce Lightning Platform.

Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q45-Q50):

NEW QUESTION # 45
Which statement accurately describes the behavior of the async/await keywords?

Answer: C

Explanation:
When async is added to a function:
async function example() {}
JavaScript guarantees:
* The function always returns a Promise , regardless of what is returned inside.
* Inside the function, await pauses execution until a Promise resolves.
* Code appears synchronous even though it uses asynchronous behavior.
Analysis of each option:
* A incorrect: Not " sometimes " -an async function always returns a Promise.
* B incorrect: Async functions can be called just like normal functions.
* C incorrect: Async/await has nothing to do with classes specifically.
* D correct: This is the standard description: "Async functions behave asynchronously but allow writing code that looks synchronous." JavaScript Knowledge References (text-only)
* async functions always return Promises.
* await pauses execution of the async function.
* Async/await syntax creates synchronous-looking code on top of asynchronous operations.


NEW QUESTION # 46
Refer to the HTML below:

Which JavaScript statement results in changing " The Lion."?

Answer: A


NEW QUESTION # 47
Refer to the following code:
< 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

Explanation:
The answer choices appear to belong to an event propagation question using nested elements such as an outer element and an inner element.
The important clue is this third argument:
addEventListener( ' click ' , handlerFunction, true);
When the third argument is true, the event listener runs during the capturing phase .
In event capturing, the browser handles the event from the outside toward the inside:
Outer element # Inner element
So, if an inner element is clicked and both the outer and inner elements have click listeners registered with capture mode set to true, the outer listener runs first, then the inner listener runs.
That produces:
Outer message
Inner message
So the matching option is B .
Important correction:
In the exact code shown, the buttons are sibling elements:
< button class= " secondary " > Save draft < /button >
< button class= " primary " > Save and close < /button >
They are not nested inside one another. Therefore, with the code exactly as written:
Clicking the secondary button logs:
Save message.
Clicking the primary button logs:
Success message.
However, because the provided answer choices refer to Outer message and Inner message , the intended concept is clearly event capturing. In a capturing-phase question with nested outer and inner elements, the correct order is:
Outer message
Inner message
Therefore, the verified answer for the intended event-capturing question is B .


NEW QUESTION # 48
Refer to the following code block:
class Animal{
constructor(name){
this.name = name;
}
makeSound(){
console.log(`${this.name} is making a sound.`)
}
}
class Dog extends Animal{
constructor(name){
super(name)
this.name = name;
}
makeSound(){
console.log(`${this.name} is barking.`)
}
}
let myDog = new Dog('Puppy');
myDog.makeSound();
What is the console output?

Answer:

Explanation:
Puppy is barking


NEW QUESTION # 49
A developer wants to use a try...catch statement to catch any error that countSheep () may throw and pass it to a handleError () function.
What is the correct implementation of the try...catch?
A)

B)

C)

D)

Answer: B


NEW QUESTION # 50
......

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