- Exam Code: JS-Dev-101
- Exam Name: Salesforce Certified JavaScript Developer - Multiple Choice
- Updated: Oct 13, 2026
- Q & A: 149 Questions and Answers
Salesforce Certified JavaScript Developer - Multiple Choice : JS-Dev-101 exam
PDF Version DemoAbout Salesforce Certified JavaScript Developer - Multiple Choice : JS-Dev-101 Exam Questions
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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:
Question #1
Refer to the code below:
01 const objBook = {
02 title: 'JavaScript',
03 };
04 Object.preventExtensions(objBook);
05 const newObjBook = objBook;
06 newObjBook.author = 'Robert';
What are the values of objBook and newObjBook respectively?
- A. { title: "JavaScript" }
{ title: "JavaScript" } - B. { author: "Robert" }
{ author: "Robert", title: "JavaScript" } - C. { author: "Robert", title: "JavaScript" }
{ author: "Robert", title: "JavaScript" } - D. { author: "Robert", title: "JavaScript" }
undefined
Correct Answer: A 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
Question #2
A developer wants to set up a secure web server with Node.js. The developer creates a directory locally called app-server, and the first file is app-server/index.js.
Without using any third-party libraries, what should the developer add to index.js to create the secure web server?
- A. const tls = require('tls');
- B. const http = require('http');
- C. const server = require('secure-server');
- D. const https = require('https');
Correct Answer: D 🗳️
Question #3
A developer publishes a new version of a package with new features that do not break backward compatibility. The previous version number was 1.1.3.
Following semantic versioning formats, what should the new package version number be?
- A. 1.1.4
- B. 1.2.0
- C. 2.0.0
- D. 1.2.3
Correct Answer: B 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
Question #4
A developer is asked to fix some bugs reported by users. To do that, the developer adds a breakpoint for debugging.
01 function Car(maxSpeed, color) {
02 this.maxSpeed = maxSpeed;
03 this.color = color;
04 }
05 let carSpeed = document.getElementById('carSpeed');
06 debugger;
07 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?
- A. The values of the carSpeed and fourWheels variables
- B. The information stored in the window.localStorage property
- C. The style, event listeners and other attributes applied to the carSpeed DOM element
- D. A variable displaying the number of instances created for the Car object
Correct Answer: B,C 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
Question #5
Which statement accurately describes the behavior of the async/await keywords?
- A. The associated class contains some asynchronous functions.
- B. The associated function sometimes returns a promise.
- C. The associated function is asynchronous, but acts like synchronous code.
- D. The associated function can only be called via asynchronous methods.
Correct Answer: C 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
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