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Instant Download Salesforce : JavaScript-Developer-I Questions & Answers as PDF & Test Engine
- Exam Code: JavaScript-Developer-I
- Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
- Updated: Nov 06, 2026
- No. of Questions: 149 Questions and Answers
- Download Limit: Unlimited
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What is the duration, language, and format of Salesforce JavaScript-Developer-I Exam
- There is a time limit of 105 minutes for the exam.
- Passing score 65%
- This exam is offered in only English.
- The type of questions is Multiple Choice and situation-based questions.
- This exam consists of 60 questions
Topics of Salesforce JavaScript Developer I Exam
Aspirants must know the exam topics before they start of preparation. Because it will help them to prepare for the below concepts Salesforce JavaScript-Developer-I exam will include the following topics:
1. Variable, Types, and Collection: 23%
Scenario based coding Variables Creation and Initialization JSON object understanding
2. Object, Functions, and Classes: 25%
Implementation of different functions Understanding of different modules of Javascript Scope of variables and their execution flow
3. Browser and Events: 17%
Handling and propagation of events Development tools of browsers Understanding of browser specific APIs
4. Asynchronous Programming: 13%
Asynchrounous programming different concepts Monitoring and management of different loops
5. Server Side Javascript: 8%
Implementation of Node.js Understanding of Node.js CLI commands
6. Testing: 7%
Unit Testing effectiveness of different tests
Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
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Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Variables, Types, and Collections | 23% | - Working with strings, numbers, dates, and booleans - Truthy and falsy values - Array methods and data manipulation - JSON parsing and usage - Type coercion and conversion rules - Variable declaration and initialization |
| Topic 2: Objects, Functions, and Classes | 25% | - Object creation, properties, and methods - Modules and imports/exports - Decorators and advanced function patterns - Function definitions, parameters, and scope - Class syntax, inheritance, and prototypes - Closures and execution context |
| Topic 3: Testing | 7% | - Testing frameworks and assertions - Unit testing concepts - Test doubles and mocks - Code coverage and best practices |
| Topic 4: Debugging and Error Handling | 7% | - Debugging tools and breakpoints - Defensive programming practices - Console methods and logging - Error types and exception handling |
| Topic 5: Server-Side JavaScript | 8% | - Node.js fundamentals and runtime - Command-line tools and scripts - Module system and require/import - Core Node.js modules |
| Topic 6: Asynchronous Programming | 13% | - Promises and chaining - Callbacks and callback hell - Event loop and micro/macro tasks - Fetch API and HTTP requests - Async/await syntax |
| Topic 7: Browsers and Events | 17% | - Document Object Model (DOM) manipulation - Browser APIs and Web Storage - Event handling, propagation, and delegation - Script loading and execution order - Window and document object properties |
Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions:
Why does second have access to variable a?
- A. Hoisting
- B. Outer function ' s scope
- C. Inner function ' s scope
- D. Prototype Chain
Correct Answer: B 🗳️
Explanation: Only visible for BraindumpsPass members. You can sign-up / login (it's free).
Refer to the code below (assuming Promise.race is intended):
let cat3 = new Promise(resolve = >
setTimeout(resolve, 3000, " Cat 3 completes " )
);
Promise.race([cat1, cat2, cat3])
.then(value = > {
let result = `${value} the race.`;
})
.catch(err = > {
console.log( " Race is cancelled: " , err);
});
(Assuming cat1 and cat2 are similar to earlier examples: cat2 resolves fastest.) What is the value of result when Promise.race executes?
- A. Race is cancelled.
- B. Car 2 completed the race.
- C. Car 3 completed the race.
- D. Car 1 crashed on the race.
Correct Answer: B 🗳️
Explanation: Only visible for BraindumpsPass members. You can sign-up / login (it's free).
Refer to the code below:
01 < html lang= " en " >
02 < table onclick= " console.log( ' Table log ' ); " >
03 < tr id= " row1 " >
04 < td > Click me! < /td >
05 < /tr >
06 < /table >
07 < script >
08 function printMessage(event) {
09 console.log( ' Row log ' );
10 event.stopPropagation();
11 }
12
13 let elem = document.getElementById( ' row1 ' );
14 elem.addEventListener( ' click ' , printMessage, false);
15 < /script >
16 < /html >
Which code change should be done for the console to log the following when " Click me! " is clicked?
Row log
Table log
- A. Remove line 10
- B. Change line 10 to event.stopPropagation(false);
- C. Change line 14 to elem.addEventListener( ' click ' , printMessage, true);
- D. Remove lines 13 and 14
Correct Answer: A 🗳️
Explanation: Only visible for BraindumpsPass members. You can sign-up / login (it's free).
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.on( ' connect ' , () = > {
console.log( ' Connected to client ' );
});
ws.on( ' error ' , (error) = > {
console.log( ' ERROR ' , error);
}); - C. try {
ws.connect(() = > {
console.log( ' Connected to client ' );
});
} catch(error) {
console.log( ' ERROR ' , error);
} - D. ws.connect(() = > {
console.log( ' Connected to client ' );
}).catch((error) = > {
console.log( ' ERROR ' , error);
});
Correct Answer: B 🗳️
Explanation: Only visible for BraindumpsPass 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(15);
console.assert(res === ' fizzbuzz ' ); - B. let res = fizzbuzz(5);
console.assert(res === ' fizz ' ); - C. let res = fizzbuzz(3);
console.assert(res === ' ' ); - D. let res = fizzbuzz(true);
console.assert(res === ' ' );
Correct Answer: A,D 🗳️
Explanation: Only visible for BraindumpsPass members. You can sign-up / login (it's free).
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