Mayuri Birle

By giving a brief introduction of myself. Okay. So I'm Mayuri Bele. Currently, I'm working as a software engineer. My current tech toolkit consists of technologies like Mounds Check, in which I have majorly worked as a front end developer and using React and Next.js as a service for server-side rendering. I also have experience in dev tools like AWS and GCP, along with expertise in serverless functions like Lambda functions and GCP Cloud functions. Additionally, I have worked with third-party APIs like Elasticsearch and Google BigQuery, and with databases, MongoDB and SQL.

To ensure that my React app is SEO friendly, especially with client-side rendering, okay. So, to make a React app SEO friendly, especially with client-side rendering, it's a bit tricky, but yes, we can use a framework like Next.js, which is generally used for server-side rendering. It's a popular framework that helps us assure the SEO of our app by providing pre-rendered content for search engines. We can also use server-side rendering for specific pages where SEO is critical. We can use React Helmet for dynamic metadata. React Helmet is a library that helps us manage changes to the document head, allowing us to set dynamic metadata. Optimizing for page speed, we can improve the page speed by implementing fast loading times through lazy loading and by implementing best practices for content like images and critical resources, including CSS and JavaScript. We can create an XML site map to ensure that our React app is SEO friendly.

In React, detail, how would you implement a feature that requires sibling components to communicate? Communication is possible through their shared parent component. There are a few ways to enable communication between sibling components. First, lifting state up to the parent component means allowing sibling components to communicate by setting up their common parent. The parent component manages the state and passes it down to the children as props along with callback functions for modifying that state. Second, we can do it by using the React Context API. If the siblings are deep in the component hierarchy and sharing data through multiple parent-child components becomes a headache, then we can use the React Context API. The context allows the state to be shared globally across components without passing props manually at each level. Third, we can use event emitters. This means we can use an event emitter like libraries like PubSub to trigger events in one component and listen to them in others. This can work well when the component hierarchy is complex. So, like this, you can implement a feature that requires sibling components to communicate.

Can you detail a scenario in which you would opt for a fragment instead of for the in a React? Okay, sure. In React, you would opt for a fragment instead of wrapping elements like div in this scenario, where you need to return multiple elements without adding extra nodes to the DOM. Using a fragment will avoid adding extra nodes to the DOM. Avoiding unnecessary DOM elements and wrapping the multiple elements inside a div or another HTML element adds an extra layer to the DOM, which can affect the layout and overall performance. So in that case, you can use a React fragment, which is nothing but an empty HTML tag, which will not increase the size of your DOM and is not going to affect the overall performance. And you can easily return its nested elements with the help of that fragment.

Okay, how do you optimize or react performance by reducing the number of it'll be renders. One is the lazy loading. As I told, we can use lazy loading with our dynamic keywords in text and suspense as a callback. We can use memo for memoization functions, like use memo and use callback. Use memo memoizes the results of the expensive computation, and only recomputes when its dependencies change. Also, in the use callback, use callback calls the functions only when the calls the functions and prevents its re-renders only. When its dependencies change, it is useful when we are passing the functions as props to the child component. Another, we can use pure components. And, like this, we can optimize the React performance by reducing the number of unnecessary renders.

When should you use a class component over a functional component in React considering life cycle methods and state management? Okay, we should use a class component over a functional component in React only for maintaining the legacy code of our projects because nowadays, functional components are provided with stateful features. Earlier, it was when React was introduced. Class components were the only stateful components, and functional components were stateless components at that moment. But afterwards, with the newer versions of React, functional components were introduced with stateful features. And, no one uses class components anymore because they are complex to manage, and they are provided with a limited number of life cycle methods. In contrast, functional components allow you to make custom hooks and use custom libraries to manage state across React applications with the help of those custom hooks. You can manage states with hooks like useState, useEffect, and useCallback. In class components earlier, it was difficult to manage complex life cycle methods, while with the help of useEffect, it can replace most of the life cycle methods. So, only in legacy code, I would suggest using a class component.

Reviewing the following CSS and explain why the elements with the box class may not look identical across different web browsers. Show the consistent styling. Okay. so you have made, a box class. You have added a attribute box sizing as the content box, which is, not appropriate. If, I guess, it doesn't look it isn't going to work on a different web browsers. I would suggest you should use a media query instead of this and to fix it so that it can work on a different web browsers.

delete person.name Okay. the potential issue is that person.name will return undefined because we have deleted the 'name' property from the person object. This is happening because we have used the 'delete' operator on person.name, which removes the property from the object. Since the property is deleted, attempting to access it will return undefined.

What are the steps to follow to migrate a React application from class component to functional component using hooks? Migrating a React application from a class component to functional component using hooks involves reflecting the code to replace the class bridge structure with a function based structure, which is quite difficult, but we can do it step by step. Firstly, we can identify the class components which need to be migrated. By identifying the class components in the complete React application, we can prioritize the simple components for initial migration. The components which don't have much lifecycle methods or which have a simple logic. So, by ensuring these things firstly, we will identify the class components to migrate to functional components. Then we will convert the class component to the functional component. We're going to replace the class component with the functional component by removing the render method and moving all the JSX directly into the return statement of the functions. Thirdly, we will handle state with the useState hook and changes with the useEffect hook by removing the lifecycle methods. Then, we can handle all the lifecycle methods with the useEffect. We can handle other lifecycle methods like shouldComponentUpdate or something like this with the hooks like use memo and useCallback. Then we can reflect the class methods to regular functions, and we can use useRef for references. And like this, we can, in the end, test and refactor our complete code. And we can migrate it from a class component to functional component using the hooks.

What patterns or techniques do I apply to ensure React components are reusable across projects? Okay, we can use props for flexibility. We can use a children prop for composition. We can use default props for flexibility. We can use TypeScript for type propagation. We can use callbacks. We can use conditional rendering. We can use higher-order functions or higher-order components, which can be reused. We can use render props like this. I guess we can ensure that React components are reusable across projects.

How do you configure Webex for a React project? How do you configure Webex for a React project to ensure an efficient build process? Okay. Configuring the configuring a Webpack for a React project. what we can do is, there are several methods to configuring a React project using a webpack by initializing