Exam Name: Salesforce Certified JavaScript Developer - Multiple Choice
Certification Provider: Salesforce
Corresponding Certification: Salesforce Developers
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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:
A developer needs the function personalizeWebsiteContent to run when the webpage is fully loaded (HTML and all external resources).
Which implementation should be used?
- A. Add a listener to the window object to handle the DOMContentLoaded event
- B. Add a handler to the personalizeWebsiteContent script to handle the DOMContentLoaded event
- C. Add a handler to the personalizeWebsiteContent script to handle the load event
- D. Add a listener to the window object to handle the load event
Correct Answer: D 🗳️
Explanation: Only visible for PassLeaderVCE members. You can sign-up / login (it's free).
Which two implementations of utils.js support foo and bar?
- A. export default class {
foo() { return 'foo'; }
bar() { return '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. const foo = () => { return 'foo'; };
const bar = () => { return 'bar'; };
export default { foo, bar };
Correct Answer: B,C 🗳️
Explanation: Only visible for PassLeaderVCE members. You can sign-up / login (it's free).
At Universal Containers, every team has its own way of copying JavaScript objects. The code snippet shows an implementation from one team:
01 function Person() {
02 this.firstName = "John";
03 this.lastName = "Doe";
04 this.name = () => {
05 console.log('Hello ${this.firstName} ${this.lastName}');
06 }
07 }
08
09 const john = new Person();
10 const dan = JSON.parse(JSON.stringify(john)); // (intended deep copy)
11 dan.firstName = 'Dan';
12 dan.name();
(Original line 10 is logically intended to be JSON.parse(JSON.stringify(john)) to perform a JSON clone.) What is the output of the code execution?
- A. Hello John Doe
- B. Hello Dan
- C. Hello Dan Doe
- D. TypeError: dan.name is not a function
Correct Answer: D 🗳️
Explanation: Only visible for PassLeaderVCE members. You can sign-up / login (it's free).
A developer has a fizzbuzz function that, when passed in a number, returns the following:
'fizz' if the number is divisible by 3.
'buzz' if the number is divisible by 5.
'fizzbuzz' if the number is divisible by both 3 and 5.
Empty string '' if the number is divisible by neither 3 nor 5.
Which two test cases properly test scenarios for the fizzbuzz function?
- A. let res = fizzbuzz(3);
console.assert(res === ''); - B. let res = fizzbuzz(15);
console.assert(res === 'fizzbuzz'); - C. let res = fizzbuzz(true);
console.assert(res === ''); - D. let res = fizzbuzz(5);
console.assert(res === 'fizz');
Correct Answer: B,C 🗳️
Explanation: Only visible for PassLeaderVCE members. You can sign-up / login (it's free).
Correct implementation of try...catch for countsDeep():
- A. try {
setTimeout(function() {
countsDeep();
}, 1000);
} catch (e) {
handleError(e);
} - B. setTimeout(function() {
try {
countsDeep();
} catch (e) {
handleError(e);
}
}, 1000); - C. try {
countsDeep();
} handleError (e){
catch(e);
} - D. try {
setTimeout(function() {
countsDeep();
}, 1000);
} catch (e) {
handleError(e);
}
Correct Answer: B 🗳️
Explanation: Only visible for PassLeaderVCE members. You can sign-up / login (it's free).
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