10+ Different Hair Interview Questions and Answers

Yes, we can send the state from a child component to a parent component in React.

• Use callback functions to pass data from child to parent

• Parent component can pass a function as a prop to child component

• Child component can call this function with the data to update parent's state

React Query is a library for managing server state in React applications.

• React Query is used for fetching, caching, synchronizing and updating server state in React applications.

• It provides hooks like useQuery and useMutation to interact with server data.

• React Query helps in handling loading, error and stale data states efficiently.

• Example: const { data, isLoading, isError } = useQuery('todos', fetchTodos)

Yes, custom hooks are reusable functions in React that allow you to extract component logic into separate functions.

• Custom hooks are created by prefixing the function name with 'use' and can be used to share logic between components.

• They can be used to manage state, side effects, and other features in functional components.

• For example, a custom hook can be created to fetch data from an API and handle loading and error states.

• Custom hooks can also be used to encapsulate comple...read more

React JS is a popular JavaScript library for building user interfaces.

• Component-based architecture

• Virtual DOM for efficient updates

• JSX syntax for writing components

• One-way data binding

• Reusable components

• React Native for mobile app development

UseEffect and UseState are React hooks used for managing state and side effects in functional components.

• UseEffect is used to perform side effects in functional components, similar to componentDidMount and componentDidUpdate in class components.

• UseState is used to manage state in functional components, allowing for re-rendering when the state changes.

• Example: const [count, setCount] = useState(0); useEffect(() => { document.title = `You clicked ${count} times`; });

Yes, I use Redux Toolkit for state management in my frontend projects.

• I use Redux Toolkit to simplify the process of managing state in my applications.

• It provides a set of tools and best practices for managing state in a predictable way.

• I find it helpful for handling complex state logic and data flow in my projects.

Redux Toolkit is an official, opinionated, batteries-included toolset for efficient Redux development.

• Official toolset for Redux

• Opinionated and batteries-included

• Helps with common Redux tasks like store setup, reducer logic, and actions

React Query is used for managing server state and caching data in React applications.

• Provides a powerful and flexible way to fetch, cache, and update data from APIs

• Automatically handles caching, background refetching, and stale data management

• Improves performance by reducing unnecessary network requests

• Simplifies data fetching and updating logic in React components

useQuery is for fetching data from the server, useMutation is for making changes to the server data.

• useQuery is used for fetching data from the server, while useMutation is used for making changes to the server data.

• useQuery is read-only and does not modify data on the server, while useMutation is used for updating, creating, or deleting data on the server.

• useQuery is typically used for GET requests, while useMutation is used for POST, PUT, DELETE requests.

• Example: useQuery c...read more

ReactJs is a JavaScript library for building user interfaces.

• ReactJs is developed and maintained by Facebook.

• It uses a component-based architecture for building reusable UI components.

• ReactJs uses a virtual DOM for efficient rendering of components.

• It allows developers to create interactive and dynamic web applications.

• ReactJs can be used with other libraries and frameworks like Redux for state management.

Reducer is a function in Redux that specifies how the application's state changes in response to actions.

• Reducer functions take the current state and an action as arguments, and return the new state.

• Reducers are pure functions, meaning they do not modify the current state, but return a new state object.

• Redux uses reducers to manage the state of the application in a predictable way.

createSlice is a function in Redux Toolkit that simplifies the process of creating Redux slices.

• createSlice is a function provided by Redux Toolkit for creating Redux slices with less boilerplate code.

• It allows developers to define a slice of the Redux state, including initial state, reducers, and action creators.

• createSlice automatically generates action types and action creators based on the defined reducers.

• It is commonly used in React applications to manage state using Re...read more

useState and useEffect are hooks in React for managing state and side effects in functional components.

• useState is a hook that allows functional components to have stateful logic.

• useEffect is a hook that allows functional components to perform side effects.

• useState example: const [count, setCount] = useState(0);

• useEffect example: useEffect(() => { console.log('Component mounted'); }, []);

Created a todo application using React Js

• Used React components to create the UI

• Implemented state management for adding, deleting, and updating todos

• Utilized local storage to persist todo data

• Styled the application using CSS or a CSS framework