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Salesforce Javascript Developer I Exam Questions

Exam Name: Salesforce Certified JavaScript Developer I
Exam Code: Javascript Developer I
Related Certification(s): Salesforce Javascript Developer I Certification
Certification Provider: Salesforce
Actual Exam Duration: 105 Minutes
Number of Javascript Developer I practice questions in our database: 224 (updated: Apr. 01, 2025)
Expected Javascript Developer I Exam Topics, as suggested by Salesforce :
  • Topic 1: Variables, Types, and Collections: The topic will test how effectively JavaScript programmers can handle variable creation, initialization, type coercion, and data manipulation. You will need to demonstrate knowledge of strings, numbers, dates, arrays, and JSON handling. The Javascript Developer I exam will require a deep understanding of these concepts and their proper application in real-world scenarios.
  • Topic 2: Objects, Functions, and Classes: In this section, the focus is on applying object-oriented principles, functions, and classes. As a Salesforce JavaScript programmer, you will need to locate optimal function implementations and understand how to structure objects and classes for business solutions. You will also be tested on your ability to use JavaScript modules and decorators, while analyzing variable scope and execution flow.
  • Topic 3: Browser and Events: The topic will challenge your ability to work with events, event handlers, and the DOM. You will need to demonstrate how to manage event propagation and utilize browser-specific APIs. Additionally, proficiency in using browser developer tools to investigate code behavior will be tested, making it crucial for you to understand browser interactions thoroughly.
  • Topic 4: Debugging and Error Handling: This section will measure the ability of JavaScript programmer to properly handle errors and debug JavaScript code. You will be expected to apply debugging techniques, such as using the console and breakpoints, to resolve issues. Proper error handling is crucial, and the exam will evaluate your skills in managing and correcting errors efficiently within your code.
  • Topic 5: Asynchronous Programming: Asynchronous programming is a key concept in JavaScript, and this section tests your understanding of event loops, asynchronous code execution, and handling promises. Salesforce JavaScript programmer will need to demonstrate their ability to implement asynchronous solutions for business requirements.
  • Topic 6: Server Side JavaScript: This section focuses on Node.js and server-side JavaScript. Salesforce JavaScript programmers will be tested on their ability to identify appropriate Node.js implementations and commands for given scenarios. Additionally, you will need to recognize which Node.js core modules, libraries, and package management solutions fit specific requirements, reflecting your understanding of server-side development with JavaScript.
  • Topic 7: Testing: In the topic, you will be required to evaluate unit tests and improve them. The exam will assess your ability to identify ineffective tests and modify them to make them more robust and accurate. This topic ensures that you can write and maintain effective tests, a crucial skill for ensuring code quality and reliability in professional environments.
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Wenona

27 days ago
Just conquered the Salesforce exam! Pass4Success, your materials were gold.
upvoted 0 times
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Dominque

2 months ago
Salesforce JavaScript Developer I certified! Pass4Success made it possible in record time.
upvoted 0 times
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Shaun

2 months ago
Cleared the Salesforce JavaScript Developer I exam! There was a tricky question about how to use the 'fetch' API for making server-side requests. I wasn't sure about the correct way to handle responses, but Pass4Success practice questions were very useful.
upvoted 0 times
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Cyndy

3 months ago
Success on the Salesforce JS Dev I exam! Pass4Success, you're the best!
upvoted 0 times
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Nicolette

3 months ago
I passed the Salesforce Certified JavaScript Developer I exam and it was quite an experience. One question that I found difficult was about the different types of collections in JavaScript, like Maps and Sets. Pass4Success practice questions were a great help.
upvoted 0 times
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Bernardo

4 months ago
Passed my Salesforce cert! Pass4Success questions were incredibly helpful.
upvoted 0 times
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Moira

4 months ago
Just passed the Salesforce JavaScript Developer I exam! There was a tough question on how to handle errors in JavaScript using try-catch blocks. I was a bit unsure, but the practice questions from Pass4Success really helped me prepare.
upvoted 0 times
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Richelle

4 months ago
I am thrilled to have passed the Salesforce Certified JavaScript Developer I exam. One question that puzzled me was about the use of 'this' keyword in JavaScript classes. I wasn't entirely confident, but Pass4Success practice questions made a big difference.
upvoted 0 times
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Daniel

5 months ago
Salesforce JavaScript Developer I - done! Pass4Success was a lifesaver for quick study.
upvoted 0 times
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Jessenia

5 months ago
Successfully passed the Salesforce JavaScript Developer I exam! There was a challenging question about the differences between 'null' and 'undefined'. I had to think hard about it, but the practice questions from Pass4Success were invaluable.
upvoted 0 times
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Walker

6 months ago
I passed the Salesforce Certified JavaScript Developer I exam and it feels great! One question that caught me off guard was about event delegation in the browser. I wasn't sure how to properly implement it, but the practice questions from Pass4Success definitely helped me.
upvoted 0 times
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Jaclyn

6 months ago
Wow, aced the Salesforce JS Dev I cert! Pass4Success made prep a breeze.
upvoted 0 times
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Sherron

6 months ago
Great insights. Thank you for sharing your experience with the Salesforce Certified JavaScript Developer I exam!
upvoted 0 times
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Zita

6 months ago
Just cleared the Salesforce JavaScript Developer I exam! There was a tricky question about how to handle promises in asynchronous programming. I was unsure about the correct syntax for chaining multiple promises. Pass4Success practice questions were a huge help in preparing for this.
upvoted 0 times
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Flo

6 months ago
Thank you! I'm just glad I passed. Pass4Success really helped me prepare efficiently in a short time. Their exam questions were spot on!
upvoted 0 times
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Lucia

7 months ago
I recently passed the Salesforce Certified JavaScript Developer I exam and it was quite a journey. One question that stumped me was about the difference between 'let' and 'const' in JavaScript. I wasn't entirely sure when to use each, but thanks to Pass4Success practice questions, I managed to get through.
upvoted 0 times
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Solange

7 months ago
Just passed the Salesforce JavaScript Developer I exam! Thanks Pass4Success for the spot-on practice questions.
upvoted 0 times
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Harrison

7 months ago
Passing the Salesforce Certified JavaScript Developer I exam was a great achievement for me, and I owe it to Pass4Success practice questions. The exam tested my knowledge on Salesforce Fundamentals and Data Modeling and Management. One question that I recall was about identifying common scenarios for expanding an org by utilizing the AppExchange. Despite some uncertainty, I successfully passed the exam.
upvoted 0 times
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Scot

8 months ago
My exam experience for the Salesforce Certified JavaScript Developer I exam was successful, thanks to Pass4Success practice questions. The topics covered in the exam included Salesforce Fundamentals and Data Modeling and Management. I remember a question that asked about the boundaries of declarative customization and the use cases for programmatic customization. Although I had some doubts, I was able to pass the exam.
upvoted 0 times
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Adela

9 months ago
Just passed the Salesforce Certified JavaScript Developer I exam! Watch out for questions on asynchronous programming, especially Promises and async/await. Understanding how to handle API responses is crucial. Big thanks to Pass4Success for their spot-on practice questions that helped me prepare quickly!
upvoted 0 times
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Twana

9 months ago
I recently passed the Salesforce Certified JavaScript Developer I exam with the help of Pass4Success practice questions. The exam covered topics such as Salesforce Fundamentals and Data Modeling and Management. One question that stood out to me was related to identifying the right data model in a given scenario. Despite being unsure of the answer, I managed to pass the exam.
upvoted 0 times
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Haley

9 months ago
Just passed the Salesforce Certified JavaScript Developer I exam! A key topic was DOM manipulation. Expect questions on selecting and modifying elements. Study methods like querySelector and addEventListener. Thanks to Pass4Success for the spot-on practice questions that helped me prepare quickly. Another important area was asynchronous JavaScript. Be ready for scenarios involving Promises and async/await. Finally, brush up on ES6+ features like arrow functions and destructuring. They came up more than I expected!
upvoted 0 times
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Pauline

9 months ago
Alex Thompson
upvoted 0 times
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Free Salesforce Javascript Developer I Exam Actual Questions

Note: Premium Questions for Javascript Developer I were last updated On Apr. 01, 2025 (see below)

Question #1

Refer to the code declarations below:

Which three expressions return the string JavaScript?

Choose 3 answers

Reveal Solution Hide Solution
Correct Answer: B, D, E

Question #2

Given the following code:

What is the output of line 02?

Reveal Solution Hide Solution
Correct Answer: D

Question #3

Refer to the following code that performs a basic mathematical operation on a provided

input:

function calculate(num) {

Return (num +10) / 3;

}

How should line 02 be written to ensure that x evaluates to 6 in the line below?

Let x = calculate (8);

Reveal Solution Hide Solution
Correct Answer: B

Question #4

Refer to the string below:

const str = 'Salesforce';

Which two statements result in the word 'Sales'?

Choose 2 answers

Reveal Solution Hide Solution
Correct Answer: B, D

Question #5

A developer has the function, shown below, that is called when a page loads.

Where can the developer see the log statement after loading the page in the browser?

Reveal Solution Hide Solution
Correct Answer: A

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