Salesforce Lightning Web Component (LWC) Interview Questions and Answers
Are you preparing for a job interview as a Salesforce developer? Do you want to brush up on your knowledge and prepare for potential questions about Salesforce Lightning Web Components (LWC)? Look no further; we have compiled a list of interview questions and their answers to help you prepare for your Salesforce LWC interview.
1. What are Salesforce Lightning Web Components (LWC)?
Salesforce Lightning Web Components (LWC) are a new programming model for building Salesforce applications. LWC is based on modern web standards and provides a user interface framework that leverages web components for developing reusable and customizable components.
2. What are the key features of Salesforce Lightning Web Components?
The key features of Salesforce Lightning Web Components include:
– Reusability: LWC encourages the development of reusable components that can be easily integrated into different applications.
– Encapsulation: LWC enforces component encapsulation, making it easier to manage and maintain code.
– Performance: LWC is optimized for performance and provides better load times and responsiveness.
– Event-driven architecture: LWC supports event-driven architecture, allowing communication between components.
– Browser compatibility: LWC is compatible with all major web browsers, ensuring a seamless user experience.
3. How is LWC different from Aura Components?
LWC differs from Aura Components in several ways, including:
– LWC is based on modern web standards and uses web components, whereas Aura Components use a proprietary framework.
– LWC has better performance and load times compared to Aura Components.
– LWC enforces component encapsulation, making it easier to manage and maintain code.
4. How can you communicate between LWC components?
Communication between LWC components can be achieved using events and properties. Events allow components to communicate with each other by dispatching and handling custom events, whereas properties allow the passing of data between components.
5. What is the difference between @api and @track in LWC?
@api and @track are decorators used in LWC to expose properties or fields for use in parent components and to track changes to property values, respectively. @api is used to mark a public property that can be accessed by a parent component, while @track is used to track changes to a property and trigger rerendering of the component.
6. How do you handle errors in LWC?
Errors in LWC can be handled using the try-catch block to catch exceptions and handle them appropriately. Additionally, LWC provides a built-in Wire Service error handling mechanism to handle errors when fetching data from the server.
7. What are the best practices for optimizing LWC performance?
Best practices for optimizing LWC performance include:
– Using the @wire service to fetch data from the server asynchronously.
– Implementing lazy loading and pagination for large datasets.
– Avoiding unnecessary re-renders by using @track and @cached decorators for property tracking.
Preparing for a Salesforce LWC interview can be challenging, but with the right knowledge and preparation, you can confidently answer questions about Salesforce Lightning Web Components. Use the above interview questions and their answers as a starting point to brush up on your LWC knowledge and ace your next Salesforce developer interview. Good luck!