Atharv Gyan

React Interview Preparation: Best Questions, Best Answers, and Sample Code 1. What are the differences between functional and class components in React? Answer : Functional components are simpler and mainly focus on rendering UI, while class components provide more powerful features like state management and lifecycle methods . In recent versions of React, hooks ( useState ,  useEffect ) enable functional components to use state and lifecycle features without needing to be classes. // Functional Component function FunctionalComponent(props) {     const [count, setCount] = useState(0);     return (         <div>             <p>Count: {count}</p>             <button onClick={() => setCount(count + 1)}>Increment</button>         </div>     ); } // Class Component class ClassComponent extends React.Component { ...

Explore various libraries, patterns, and approaches to handle state efficiently in React applications. As React applications expand, managing state becomes increasingly intricate. This is a discussion of sophisticated state management strategies, libraries, and patterns: Libraries Redux : A popular library for managing application state, providing a single source of truth and enabling predictable state transitions. MobX : Uses observables and reactions to manage state, offering a more object-oriented approach. Recoil : Developed by Facebook, this library simplifies state management with atoms and selectors for a more intuitive API. Patterns Context API : Useful for prop drilling avoidance by providing a way to pass data through the component tree without manually passing props. State Machines (XState) : Helps model state transitions explicitly, making the application’s behavior predictable and easier to debug. Approaches Component Local State : For small applications, keeping state loc...