Salesforce Certified Js Developer Practice Exam
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Start NowAbout the Salesforce Certified Js Developer Certification
The Salesforce Certified Js Developer certification is designed for professionals who demonstrate expertise in JavaScript, build custom web components, and extend platform functionality through advanced scripting. As technology evolves and industry demands grow more complex; this credential validates your ability to apply real-world skills and knowledge using Salesforce tools and frameworks. Earning the certification positions you as a trusted expert, capable of solving high-impact challenges and contributing to secure, scalable, and efficient systems.
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Test Your Knowledge of Salesforce Certified Js Developer
Question #1
A developer needs to create a reusable Lightning Web Component (LWC) for multiple pages.
What’s the best practice?
A) Build the component with configurable properties and publish it on Lightning App Builder.
B) Hardcode values in the component.
C) Only use Aura components.
D) Create separate components for each page.
Solution
Correct answers: A – Explanation:
Configurable LWCs increase reusability and flexibility. Hardcoding or multiple components reduce maintainability.
Question #2
The team wants to improve client-side performance in a Lightning app.
What should they do?
A) Minimize component re-rendering and use lazy loading where possible.
B) Load all components on page load.
C) Use synchronous Apex calls.
D) Ignore performance optimizations.
Solution
Correct answers: A – Explanation:
Minimizing re-render and lazy loading improves performance. Loading all components or sync calls degrade speed.
Question #3
A developer needs to handle user input validation in a Lightning web component.
What’s the recommended method?
A) Use standard HTML input validation and Lightning data service validation.
B) Only validate on the server side.
C) Skip validation.
D) Use custom JavaScript without standards.
Solution
Correct answers: A – Explanation:
Combining HTML and LDS validation ensures robust input checking. Server-only or no validation risks errors.
Question #4
The team wants to integrate third-party JavaScript libraries into their Salesforce app.
What’s the best approach?
A) Use static resources to upload libraries and import them into LWCs.
B) Link to external CDNs directly.
C) Embed scripts in Visualforce only.
D) Ignore third-party libraries.
Solution
Correct answers: A – Explanation:
Static resources and imports are secure and manageable. External CDNs or ignoring libraries are less reliable.
Question #5
A developer needs to communicate between sibling LWCs.
What’s the best technique?
A) Use a Lightning Message Service or pub-sub model.
B) Use global variables.
C) Pass data only through parent components.
D) Use cookies.
Solution
Correct answers: A – Explanation:
Lightning Message Service enables decoupled communication. Global variables or cookies are not recommended.
Question #6
The team wants to debug JavaScript errors in production.
What tool should they use?
A) Use browser developer tools and Salesforce Debug Logs.
B) Only rely on user reports.
C) Ignore errors unless critical.
D) Use print statements only.
Solution
Correct answers: A – Explanation:
Developer tools and logs provide detailed debugging. Ignoring or manual print statements are ineffective.
Question #7
The company needs to build a custom UI for complex data visualization.
What framework should they consider?
A) Use Lightning Web Components with D3.js or other JS visualization libraries.
B) Only use standard Salesforce charts.
C) Build UI in Visualforce only.
D) Create separate components for each page.
Solution
Correct answers: A – Explanation:
LWCs with JS libraries support rich visualizations. Standard charts or static images limit flexibility.
Question #8
The team wants to improve code quality and consistency.
What’s the recommended practice?
A) Use ESLint and code reviews as part of the development process.
B) Skip linting.
C) Only check code after deployment.
D) Ignore best practices.
Solution
Correct answers: A – Explanation:
Configurable LWCs increase reusability and flexibility. Hardcoding or multiple components reduce maintainability.
Question #9
Developers need to handle asynchronous data calls in LWCs.
What’s the best approach?
A) Use Promises and async/await syntax for clean, manageable code.
B) Use only callbacks.
C) Block UI during calls.
D) Ignore async handling.
Solution
Correct answers: A – Explanation:
Promises and async/await improve readability and error handling. Callbacks or blocking UI reduce user experience.
Question #10
The business wants to ensure accessibility compliance in custom components.
What should developers do?
A) Use ARIA roles, labels, and test with screen readers.
B) Ignore accessibility.
C) Only design for mouse users.
D) Use decorative elements without semantics.
Solution
Correct answers: A – Explanation:
ARIA and testing ensure compliance. Ignoring accessibility excludes users.
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