Salesforce Lightning Interview Questions and Answers for 2 years experience

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Salesforce Lightning Interview Questions & Answers

  1. What is Salesforce Lightning?

    • Answer: Salesforce Lightning is a modern, user-friendly interface for Salesforce, offering a faster, more intuitive experience than the classic interface. It leverages a component-based architecture, allowing for customization and increased productivity. It includes features like the Lightning App Builder, Lightning Web Components (LWC), and the Lightning Experience.

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

    • Answer: Lightning Experience is a modern, responsive, and customizable user interface built on a component-based architecture. Salesforce Classic is the older, more traditional interface. Lightning Experience offers improved performance, a more intuitive user experience, and extensive customization options through the App Builder and LWCs, whereas Classic is less flexible and often slower.

  3. What are Lightning Web Components (LWC)?

    • Answer: Lightning Web Components (LWCs) are a framework for building Lightning components using modern JavaScript and web standards like HTML and CSS. They offer a lightweight, performant, and efficient way to extend Salesforce functionality and create custom user interfaces.

  4. What are Aura Components? How do they differ from LWCs?

    • Answer: Aura components were the original framework for building custom components in Lightning Experience. LWCs are the newer, recommended framework. Key differences include: LWCs use modern web standards (HTML, JavaScript, CSS), while Aura uses a proprietary framework; LWCs are generally more performant and easier to debug; LWCs offer better interoperability with other web technologies.

  5. Explain the Lightning App Builder.

    • Answer: The Lightning App Builder is a drag-and-drop interface for creating custom Lightning pages and apps without coding. It allows users to visually assemble pre-built components and custom components to create tailored user experiences.

  6. How do you create a custom Lightning component? (Both LWC and Aura, if familiar with both)

    • Answer: For LWC, you create a folder structure with HTML, JavaScript, and CSS files. The JavaScript file handles the component's logic, and the HTML file defines its structure. For Aura, you create a component bundle with a .cmp file (markup), .js controller, .css stylesheet, and potentially a .design file (for visual styling). The process involves creating the files, defining the component's properties and events, and wiring them together.

  7. Explain the concept of Lightning Data Service (LDS).

    • Answer: The Lightning Data Service (LDS) is a framework for accessing Salesforce data from Lightning components. It provides a standardized way to fetch, create, update, and delete records, optimizing data fetching and reducing network calls for improved performance. It handles data caching and change propagation automatically.

  8. What are the different types of Lightning components?

    • Answer: There are various types of Lightning components, including: standard components provided by Salesforce, custom components built using LWC or Aura, and composed components that combine multiple components.

  9. How do you handle events in Lightning Web Components?

    • Answer: Events are handled using custom events in LWCs. You dispatch an event from a child component, and a parent component can listen for and handle that event. This enables communication between components.

  10. What are the different ways to deploy Lightning components?

    • Answer: Lightning components can be deployed using various methods, including the Salesforce DX command-line interface (CLI), Ant Migration Tool, or through the Salesforce user interface directly.

  11. Describe your experience with Lightning Flow.

    • Answer: [Describe your experience with creating and using Lightning Flows, including types of flows used – screen flows, autolaunched flows, etc., and any complex flows implemented.]

  12. How do you debug Lightning Web Components?

    • Answer: Debugging LWCs typically involves using the browser's developer tools (e.g., Chrome DevTools) to inspect the component's code, network requests, and console logs. Setting breakpoints in the JavaScript code helps identify and resolve issues.

  13. What is a Lightning Community?

    • Answer: A Lightning Community is a branded, customizable online space built on Salesforce for customers, partners, or employees to interact and collaborate. They can be used for knowledge sharing, support, and internal communication.

  14. Explain the concept of namespaces in Salesforce development.

    • Answer: Namespaces are used to prevent naming conflicts when multiple organizations or developers are working with the same Salesforce org. They provide a way to isolate custom components and other metadata.

  15. How do you handle error handling in LWCs?

    • Answer: Error handling in LWCs typically involves using try-catch blocks in the JavaScript code to handle exceptions gracefully and prevent crashes. Error messages can be displayed to the user, or logged for debugging purposes.

  16. What are some best practices for building performant Lightning components?

    • Answer: Best practices include: optimizing data fetching using LDS, minimizing the number of components, using efficient JavaScript and CSS, and leveraging client-side caching. Avoid unnecessary re-renders and use debouncing/throttling for large datasets.

  17. How do you secure Lightning components and data?

    • Answer: Security is crucial. Use appropriate sharing rules and permission sets to control access to data. Validate user input to prevent injection attacks. Employ best practices for API usage and authentication. Use appropriate profile and permission set settings.

  18. Explain your experience with version control (e.g., Git).

    • Answer: [Describe your experience with using Git or other version control systems for Salesforce development, including branching strategies, merging, and conflict resolution.]

  19. What are some common challenges you've faced while working with Salesforce Lightning, and how did you overcome them?

    • Answer: [Describe specific challenges encountered, such as performance issues, complex data relationships, or debugging difficulties. Explain the steps taken to resolve them.]

  20. What are your preferred tools and technologies for Salesforce Lightning development?

    • Answer: [List preferred IDEs, debugging tools, and other relevant technologies used in your Salesforce development workflow.]

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