JS-Dev-101 exam dumps

Salesforce JS-Dev-101 Value Package

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  • Exam Code: JS-Dev-101
  • Exam Name: Salesforce Certified JavaScript Developer - Multiple Choice
  • No. of Questions: 149 Questions and Answers
  • Updated: Nov 06, 2026

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Salesforce JS-Dev-101 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 2
  • Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 3
  • Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.

Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions:

01 function changeValue(obj) {
02 obj.value = obj.value / 2;
03 }
04 const objA = { value: 10 };
05 const objB = objA;
06
07 changeValue(objB);
08 const result = objA.value;
What is the value of result?

  • A. undefined
  • B. 10
  • C. NaN
  • D. 5
Reveal Solution  Discussion  0

Correct Answer: D  🗳️

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

  • A. The function uses the this from the enclosing scope.
  • B. The function receives an argument called parentThis, giving the enclosing lexical scope.
  • C. The function generates its own this making it useful for separating scope.
  • D. If the function has a single expression in the function body, the expression will be evaluated and implicitly returned.
Reveal Solution  Discussion  0

Correct Answer: A,D  🗳️

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Refer to the code below:
flag();
function flag() {
console.log('flag');
}
const anotherFlag = () => {
console.log('another flag');
}
anotherFlag();
What is result of the code block?

  • A. The console logs only 'flag'.
  • B. An error is thrown.
  • C. The console logs 'flag' and 'another flag'.
  • D. The console logs 'flag' and then an error is thrown.
Reveal Solution  Discussion  0

Correct Answer: C  🗳️

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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.on('connect', () => {
    console.log('Connected to client');
    });
    ws.on('error', (error) => {
    console.log('ERROR', error);
    });
  • B. ws.connect(() => {
    console.log('Connected to client');
    }).catch((error) => {
    console.log('ERROR', error);
    });
  • C. ws.on('connect', () => {
    console.log('Connected to client');
    });
    ws.on('error', (error) => {
    console.log('ERROR', error);
    });
  • D. try {
    ws.connect(() => {
    console.log('Connected to client');
    });
    } catch(error) {
    console.log('ERROR', error);
Reveal Solution  Discussion  0

Correct Answer: C  🗳️

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A team at Universal Containers works on a big project and uses yarn to manage the project's dependencies.
A developer added a dependency to manipulate dates and pushed the updates to the remote repository. The rest of the team complains that the dependency does not get downloaded when they execute yarn.
What could be the reason for this?

  • A. The developer added the dependency as a dev dependency, and NODE_ENV is set to production.
  • B. The developer missed the option --add when adding the dependency.
  • C. The developer missed the option --save when adding the dependency.
  • D. The developer added the dependency as a dev dependency, and YARN_ENV is set to production.
Reveal Solution  Discussion  0

Correct Answer: A  🗳️

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