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Salesforce JS-Dev-101 Exam Syllabus Topics:
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Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions:
Original code:
01 let requestPromise = client.getRequest;
03 requestPromise().then((response) => {
04 handleResponse(response);
05 });
The developer wants to gracefully handle errors from a Promise-based GET request.
Which code modification is correct?
- A. Add .catch to the Promise chain
- B. Use finally handler for errors
- C. try/catch around requestPromise().then(...)
- D. (duplicate of A)
Correct Answer: A 🗳️
Explanation: Only visible for DumpsReview members. You can sign-up / login (it's free).
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. > Uncaught ReferenceError
- B. > Puppy is barking.
- C. > Undefined
Correct Answer: B 🗳️
Explanation: Only visible for DumpsReview members. You can sign-up / login (it's free).
A developer implements a function that adds a few values.
function sum(num1, num2, num3) {
if (num3 === undefined) {
num3 = 0;
}
return num1 + num2 + num3;
}
Which three options can the developer invoke for this function to get a return value of 10?
- A. sum(5, 5, 0);
- B. sum()(10);
- C. sum(5, 2, 3);
- D. sum(5)(5);
- E. sum(10, 0);
Correct Answer: A,C,E 🗳️
Explanation: Only visible for DumpsReview members. You can sign-up / login (it's free).
Refer to the code below:
01 let total = 10;
02 const interval = setInterval(() => {
03 total++;
04 clearInterval(interval);
05 total++;
06 }, 0);
07 total++;
08 console.log(total);
Considering that JavaScript is single-threaded, what is the output of line 08 after the code executes?
- A. 12
- B. 11
- C. 13
- D. 10
Correct Answer: B 🗳️
Explanation: Only visible for DumpsReview members. You can sign-up / login (it's free).
A developer has two ways to write a function:
Option A:
01 function Monster() {
02 this.growl = () => {
03 console.log("Grr!");
04 }
05 }
Option B:
01 function Monster() {};
02 Monster.prototype.growl = () => {
03 console.log("Grr!");
04 }
After deciding on an option, the developer creates 1000 monster objects. How many growl methods are created with Option A and Option B?
- A. 1 growl method is created for Option A. 1000 growl methods are created for Option B.
- B. 1000 growl methods are created regardless of which option is used.
- C. 1000 growl methods are created for Option A. 1 growl method is created for Option B.
- D. 1 growl method is created regardless of which option is used.
Correct Answer: C 🗳️
Explanation: Only visible for DumpsReview members. You can sign-up / login (it's free).
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