Interview Questions of react
Top 100 React Interview Questions for 2024 As a developer, I've been given a lot of React interviews, and I've noticed a pattern in the types of questions asked. Whether you're preparing for your first React interview or just want to brush up on your skills, I am here with the Top 100 React Interview Questions for 2024, based on my experience and what's currently trending in the tech world.
By the end of the questions, I will also share my personal experience with React Interviews.
React has become one of the most popular JavaScript libraries for building user interfaces, especially for single-page applications.
Let's directly proceed to the questions first. Then I will share my personal experience of React Interviews and then at the end, there are amazing surprise questions for you.
What is React.js and how does it differ from other JavaScript frameworks?Explain the concept of virtual DOM in React.js and its advantages.What are the key features of React.js that make it unique?What is JSX? Explain its syntax and benefits.How do you create components in React.js?What is the difference between state and props in React.js?Explain the component lifecycle methods in React.js.How do you handle events in React.js?What is the purpose of using keys in React.js lists?How do you conditionally render elements in React.js?What is the use of refs in React.js?Explain the concept of controlled and uncontrolled components in React.js.What is the purpose of using higher-order components (HOCs) in React.js?How do you implement routing in a React.js application?What is the purpose of using Redux in a React.js application?Explain the concept of actions, reducers, and stores in Redux.How do you handle asynchronous actions in Redux using middleware like Thunk or Saga?What is the purpose of using React Hooks?Explain the useState and useEffect hooks in React.How do you implement custom hooks in React.js?What is the purpose of using the useContext hook in React?How do you implement code splitting in a React.js application?What is the purpose of using React Fragments?How do you optimize performance in a React.js application?What is the purpose of using React Portals?Explain the concept of error boundaries in React.js.How do you implement server-side rendering (SSR) in a React.js application?What is the purpose of using React Memo?How do you implement lazy loading in a React.js application?What is the purpose of using the useCallback hook in React?How do you implement unit testing in a React.js application?What is the purpose of using the useMemo hook in React?How do you implement accessibility in a React.js application?What is the purpose of using the useReducer hook in React?How do you implement internationalization (i18n) in a React.js application?What is the purpose of using the useImperativeHandle hook in React?How do you implement code reusability in a React.js application using hooks?What is the purpose of using the useLayoutEffect hook in React?How do you implement performance optimization techniques in a React.js application?What is the purpose of using the useDebugValue hook in React?How do you implement state management in a React.js application using hooks?What is the purpose of using the useTransition hook in React?How do you implement data fetching in a React.js application using hooks?What is the purpose of using the useDeferredValue hook in React?How do you implement form handling in a React.js application using hooks?What is the purpose of using the useId hook in React?How do you implement context management in a React.js application using hooks?What is the purpose of using the useInsertionEffect hook in React?How do you implement performance optimization techniques in a React.js application using hooks?What is the purpose of using the useOpaqueIdentifier hook in React?What is the difference between a functional component and a class component in React?How do you manage state in a functional component?What are props in React, and how are they used?What is the purpose of the render method in a class component?How do you pass data from a parent component to a child component?What is the significance of the key prop in lists?How can you prevent a component from re-rendering?What are default props in React?How do you handle forms in React?What is the purpose of the shouldComponentUpdate lifecycle method?Intermediate-level Questions Practical-Scenario Questions Personal Experience with React Interviews From my own experience, interviewers usually look at both how well you understand React theoretically and how well you can use it in real life.
In one interview, I was asked to build a small to-do app in React on a shared screen. It wasn't just about making it work, they were interested in how I handled state management, if I used hooks effectively, and how I structured my components.
In another interview, I was asked to explain how I would optimize a React app for performance. They wanted detailed explanations, so I talked about using React.memo, lazy loading, and optimizing state management.
Giving examples of projects I've worked on before where I used these techniques helped make my points clear and showed that I wasn't just knowledgeable about them in theory.
They can even ask you some behavioral questions. Some examples I am giving here, which you must prepare, before appearing in React Interview.
Behavioral Questions and Soft Skills There can be many more questions, if you want to get a list of such questions, let me know in the comments.
To get ready for a React interview, you need to know the basic ideas, practice common patterns, and keep up with the newest features and trends.
You'll be ready for any React job in 2024 if you go over these questions again and think about your own experiences.
Remember that interviews aren't just about showing how knowledgeable you are about a subject. They are also about showing how well you can solve problems and how eager you are to learn.
All the best for your React Interview.
