Lwc Salesforce Interview Questions

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Lwc Salesforce Interview Questions

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Lwc Salesforce Interview Questions

In interviews for Salesforce positions requiring Lightning Web Components (LWC) expertise, candidates may be asked about their experience creating interactive web components using JavaScript and HTML, as well as their knowledge of Salesforce platform features such as data binding, event handling, and Apex integration. Interviewers may also inquire about their understanding of Aura components, best practices for optimizing LWC performance, and how they approach testing and debugging LWC code. Additionally, candidates may be tested on their familiarity with Salesforce development tools like Visual Studio Code and Salesforce CLI, as well as their ability to work effectively in a team and communicate technical concepts clearly.

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1 - What is Lightning Web Components (LWC) in Salesforce?

Lightning Web Components (LWC) is a programming model for building lightweight and powerful web components on the Salesforce platform. They are built using modern web standards such as ECMAScript 6, HTML5, and CSS3, offering better performance compared to Aura components.

2) How are LWC different from Aura components?

LWC follows the modern web standards while Aura components use their own custom framework. LWC leverages the native capabilities of the browser for better performance and efficiency, making them more lightweight and faster than Aura components.

3) What are the key features of Lightning Web Components?

Key features of Lightning Web Components include reusability, performance, encapsulation, and productivity. LWC promotes code reusability through modular design, provides better performance by leveraging the browser's capabilities, ensures encapsulation of components for better security, and improves developer productivity by offering a more intuitive development model.

4) How can LWC interact with Salesforce data?

LWC can interact with Salesforce data using Apex, Lightning Data Service, or the Salesforce REST APIs. By using Apex with the `@AuraEnabled` annotation, LWC components can communicate with the Salesforce backend to fetch or manipulate data. Lightning Data Service can be used to retrieve and cache records, while Salesforce REST APIs offer a wide range of functionalities to interact with Salesforce data.

5) Can LWC be integrated with third party libraries?

Yes, LWC can be easily integrated with third party libraries such as D3.js, Chart.js, or any other JavaScript library using the `import` statement. This allows developers to extend the functionality of their Lightning components by leveraging the capabilities of existing libraries.

6) How can you unit test Lightning Web Components?

Lightning Web Components can be unit tested using tools like Jest or Salesforce's own testing framework. Developers can write test scripts to cover different scenarios and functionalities of their components to ensure that they work as expected under various conditions.

7) What is the role of the Lightning App Builder in working with LWC?

Lightning App Builder allows users to create custom pages by dragging and dropping components, including LWC components, onto the page layout. It provides a visual interface for designing and configuring the user interface without having to write code, making it easier to build custom experiences using Lightning Web Components. 

8) How do you communicate between LWC components?

LWC components can communicate with each other using the Lightning Message Service, an event driven messaging system provided by Salesforce. This allows components to communicate without having a direct parent child relationship, enabling more flexible and decoupled component interactions within the Lightning Experience.


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