Salesforce Lightning Interview Questions and Answers

Ques 1. What is Salesforce Lightning?

Salesforce Lightning is a component-based framework for app development from Salesforce.com.

Example:

Lightning Components allow developers to build dynamic, responsive web applications for mobile and desktop devices.

Ques 2. Explain the difference between Salesforce Classic and Salesforce Lightning Experience.

Salesforce Classic is the older user interface, while Salesforce Lightning Experience is the modern, more dynamic UI.

Example:

Lightning Experience provides a more streamlined and user-friendly interface compared to Classic.

Ques 3. What is a Lightning Component?

A Lightning Component is a reusable and customizable unit of functionality in the Lightning framework.

Example:

You can create Lightning Components to represent parts of your user interface or to perform specific tasks.

Ques 4. What is the purpose of the Lightning Design System (SLDS)?

The Lightning Design System is a CSS framework provided by Salesforce for building responsive and consistent user interfaces.

Example:

SLDS ensures a unified look and feel across all Salesforce applications and components.

Ques 5. What is the Lightning App Builder?

The Lightning App Builder is a visual tool for creating pages for the Salesforce mobile app and Lightning Experience.

Example:

Administrators can use it to customize the layout of pages by dragging and dropping components.

Ques 6. Explain the concept of Lightning App Builder.

The Lightning App Builder is a visual tool that allows users to create custom pages for the Salesforce mobile app or Lightning Experience without code.

Example:

Administrators can drag and drop components onto the page to create a tailored user experience.

Ques 7. Explain the concept of Lightning App Page in Salesforce Lightning.

A Lightning App Page is a page layout that specifies the components and their arrangement for a Lightning app.

Example:

It defines how the app's components are displayed to users when they access the app.

Ques 8. Explain the concept of Lightning App Builder.

Lightning App Builder is a visual tool that allows users to create custom pages for the Salesforce mobile app or Lightning Experience without code.

Example:

Using Lightning App Builder, administrators can drag and drop components to design custom pages.

Ques 9. What is the purpose of Lightning Record Page?

Lightning Record Pages are used to customize the layout and organization of information for a specific object's record in Lightning Experience.

Example:

You can use Lightning Record Pages to create a tailored user experience for different record types.

Ques 10. How does event-driven programming work in Salesforce Lightning?

Events in Salesforce Lightning are used to communicate between components and enable a loosely coupled architecture.

Example:

A Lightning Component can fire an event, and other components can listen and respond to that event.

Ques 11. What is a Lightning Web Component (LWC)?

A Lightning Web Component (LWC) is a lightweight, standards-based component framework for building web components on the Salesforce platform.

Example:

LWC uses modern JavaScript and HTML to build components that are interoperable with web standards.

Ques 12. Explain the role of Aura framework in Salesforce Lightning.

The Aura framework is the underlying framework for the Lightning Component framework, providing the runtime for Lightning Components.

Example:

Developers use Aura framework to build reusable components that can be used in the Lightning Experience.

Ques 13. How do you handle errors in Lightning components?

Errors in Lightning components can be handled using the try-catch block in JavaScript or by using the Lightning:notificationsLibrary component.

Example:

You can display error messages to users or log errors for debugging purposes.

Ques 14. How do you implement a Lightning Component in a Visualforce page?

You can use the tag to include a Lightning Component in a Visualforce page.

Example:

Ques 15. Explain the role of Apex in Salesforce Lightning.

Apex is used in Salesforce Lightning to implement server-side logic for Lightning components.

Example:

You can use Apex controllers to handle server-side processing and interact with the Salesforce database.

Ques 16. What is the difference between application events and component events in Lightning?

Application events are used for communication between components that are not in the same containment hierarchy, while component events are for communication between components in the same hierarchy.

Example:

Use application events when components are not directly related, and component events when they are.

Ques 17. Explain Lightning Locker Service.

Lightning Locker Service enhances security by isolating components in their own namespace, preventing access to global resources.

Example:

It helps in preventing cross-site scripting (XSS) and ensures a secure environment for Lightning components.

Ques 18. How can you use Lightning components in Salesforce1 mobile app?

You can use the Salesforce1 navigation menu to access Lightning components in the Salesforce1 mobile app.

Example:

By adding your Lightning component to a Lightning app and configuring it for the Salesforce1 navigation menu.

Ques 19. What is the purpose of the aura:iteration tag in Lightning components?

The aura:iteration tag is used to iterate over a collection of items and generate the specified HTML or components for each item.

Example:

It is useful for displaying lists or tables of data in a Lightning component.

Ques 20. Explain the use of Lightning Data Table in Lightning components.

Lightning Data Table is a component that displays a table of data with features like sorting, inline editing, and row selection.

Example:

It is often used to present data in a tabular format within Lightning components.

Ques 21. What is the purpose of the lightning:recordEditForm component?

The lightning:recordEditForm component is used to create a form for editing a record in Lightning Experience or Salesforce mobile app.

Example:

It simplifies the process of creating, updating, or deleting records in a Lightning component.

Ques 22. What is the purpose of the lightning:overlayLibrary component?

The lightning:overlayLibrary component is used to create modals, popovers, and other overlay components in Lightning Experience.

Example:

It provides a standardized way to create and manage overlay components.

Ques 23. How can you use Lightning components in Visualforce pages?

You can use the apex:includeLightning tag to include Lightning components in Visualforce pages.

Example:

Ques 24. What is the Lightning App Development Lifecycle?

The Lightning App Development Lifecycle involves creating, deploying, and managing Lightning apps and components.

Example:

It includes stages like development, testing, packaging, and deployment of Lightning components and apps.

Ques 25. How can you optimize performance in Salesforce Lightning components?

Performance optimization in Salesforce Lightning involves reducing the number of server calls, optimizing code, and using features like caching.

Example:

Implementing client-side caching and minimizing server round trips are strategies for optimization.

Ques 26. Explain Lightning Data Service (LDS).

Lightning Data Service is a standard controller for Lightning components that enables efficient access to data without the need for Apex code.

Example:

LDS automatically loads and caches records, reducing the need for server calls in Lightning components.

Ques 27. What is Lightning Out?

Lightning Out allows you to embed Lightning components in external web pages using JavaScript.

Example:

It extends the use of Lightning components beyond the Salesforce platform.

Ques 28. How can you handle security in Salesforce Lightning components?

Security in Salesforce Lightning components is managed through access settings, Lightning Component framework security, and Apex class security.

Example:

You can control access to Lightning components by setting user profiles, permission sets, and ensuring secure Apex code.

Ques 29. How can you implement client-side caching in Lightning components?

Client-side caching in Lightning components can be implemented using Lightning Data Service (LDS) or browser caching.

Example:

LDS automatically caches records, and you can use the browser's caching mechanism for static resources.

Ques 30. How can you communicate between Lightning components in different Aura frameworks?

You can use Lightning Message Service to communicate between Lightning components in different Aura frameworks.

Example:

It enables communication across the DOM and between Aura components in different frameworks.