Interview Questions And Answers React Js
React Interview Questions and Answers: A Comprehensive Guide
Interview Questions And Answers React Js
Interview questions and answers for React JS are essential for both interviewers and candidates to gauge the candidate's technical abilities, problem-solving skills, and understanding of React JS concepts. By preparing for these questions, candidates can demonstrate their knowledge and showcase their proficiency in React JS, while interviewers can assess the candidate's suitability for the role and make informed hiring decisions.
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1 - Q: Describe the React lifecycle and its methods.
A: The React lifecycle includes methods like `componentDidMount`, `componentDidUpdate`, `componentWillUnmount`, used to handle component mounting, updating, and unmounting.
2) Q: Explain how state and props work in React.
A: State is the internal data managed by a component and props are the external data passed to the component. State can be updated using `setState`, while props are immutable and passed down from a parent component.
3) Q: What's the difference between class and function components?
A: Class components use `class` syntax and have access to lifecycle methods, while function components are defined using arrow functions and handle state and lifecycle with hooks.
4) Q: What are hooks?
A: Hooks are functions that provide access to state, lifecycle methods, and other React features in functional components.
5) Q: Explain how React handles routing.
A: React uses the `react router` library for routing. It allows navigating between different parts of the application, maintaining the state, and updating the URL accordingly.
6) Q: What are some common performance optimization techniques in React?
A: Optimizing React performance involves techniques like using `shouldComponentUpdate`, memoizing components, using the `useMemo` and `useCallback` hooks, and batching state updates.
7) Q: Describe the differences between `props` and `state` in React.
A: Props are immutable data passed from parent to child components, while state is mutable data managed within a component. Props are used to pass data around, while state represents the component's internal data.
8) Q: Explain the role of a Redux store in React applications.
A: Redux is a state management library that provides a centralized store for managing application state. The store holds the state of the entire application, and components can access and update it using actions.
9) Q: What is the difference between synthetic and native events in React?
A: Synthetic events are React's own cross browser event system, abstracting browser specific events. Native events are the original browser events that occur in the DOM. React uses synthetic events by default.
10) Q: Describe the concept of unidirectional data flow in React.
A: In React, data flows unidirectionally from parent to child components through props. This ensures that changes in the parent component's state are reflected in the child component's props, maintaining consistency and preventing unexpected behavior.
11 - Q: What is the context API in React?
A: The Context API provides a way to pass data across different levels of the component hierarchy without explicitly passing props at each level. It allows child components to access data from parent components without having to know about the intermediate components.
12) Q: Explain the use of the `useEffect` hook in React.
A: The `useEffect` hook is a React hook that allows you to perform side effects in functional components, such as fetching data, setting up subscriptions, or updating the DOM. It runs after every render and is commonly used for handling lifecycle events and interactions with external APIs.
13) Q: What is the difference between controlled and uncontrolled components in React?
A: In React, form inputs can be either controlled or uncontrolled. Controlled components have their state managed by the application, while uncontrolled components manage their own state. Controlled components allow for more control over the input data, as the application can validate and update the input before submitting it.
14) Q: Describe the use of the `useState` hook in React.
A: The `useState` hook is a React hook that allows you to create and manage state within functional components. It takes an initial value and returns an array with two elements: the current state value and a function to update the state. It simplifies state management, eliminating the need for class components or Redux.
15) Q: What are some best practices for writing clean and maintainable React code?
A: Best practices for writing clean and maintainable React code include using consistent naming conventions, organizing components into logical modules, utilizing hooks effectively, leveraging the React ecosystem, and implementing unit testing. By adhering to these practices, developers can create React applications that are easy to read, understand, and maintain.
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