Top LWC Interview Q&A – DevFacts

Salesforce Lightning Web Component (LWC) is a modern Salesforce development framework that allows developers to build applications and components using web standards like HTML, CSS, and JavaScript. As more and more developers are moving towards LWC for their Salesforce development, it’s important to be prepared for interviews that focus on this technology.

In this article, we will discuss some of the common Salesforce Lightning Web Component interview questions and provide you with detailed answers to help you prepare for your next interview.

1. What are Lightning Web Components (LWC)?

Answer: Lightning Web Components (LWC) are a new programming model for building Lightning components. They leverage the web standards of HTML, CSS, and JavaScript and can be used to build custom components and applications on the Salesforce platform.

2. What are the key differences between Aura Components and Lightning Web Components?

Answer: Aura Components are built using the Aura framework and require more code to achieve the same functionality as LWC. LWC, on the other hand, is based on modern web standards and offers better performance and a more intuitive programming model. LWC also provides better encapsulation and reusability.

3. What are the advantages of using Lightning Web Components?

Answer: Lightning Web Components offer several advantages, including better performance, improved encapsulation and reusability, easier debugging, enhanced error handling, and a more modern programming model that is easier to learn and use.

4. How are Lightning Web Components packaged and deployed?

Answer: Lightning Web Components are packaged and deployed using Salesforce DX, which provides a set of tools and features for developing and packaging Salesforce applications. LWC can be deployed as part of a managed or unmanaged package and can be installed in any Salesforce org.

5. How do you communicate between Lightning Web Components?

Answer: Lightning Web Components communicate with each other using events and properties. Events can be used to communicate upwards and downwards in the component hierarchy, while properties can be used to pass data between components.

6. How can you call Apex methods from a Lightning Web Component?

Answer: Apex methods can be called from a Lightning Web Component using the @wire decorator or by using the imperative Apex method call. The @wire decorator is used to call an Apex method when the component is loaded, while the imperative Apex method call is used to call an Apex method based on user interaction or other events.

7. What are the best practices for writing Lightning Web Components?

Answer: Some best practices for writing Lightning Web Components include using the wire service for data retrieval, embracing the event-driven architecture, using modern JavaScript features, and writing unit tests for your components.

In conclusion, being prepared for a Salesforce Lightning Web Component interview is crucial to securing a job or promotion in the Salesforce ecosystem. By understanding and being able to confidently answer the above questions, you can showcase your knowledge and expertise in LWC and stand out in your interview. Good luck!

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