Technical Question Bank · Peer-Reviewed
Search and filter frequently asked interview questions across technical, programming, and behavioral domains. Tailor your interview preparation by difficulty for freshers or experienced developers (60 available).
When a user logs in and reload, to persist the state generally we add the load user action in the useEffect hooks in the main App.js. While using Redux, loadUser action c...
The `useReducer` hook is a React hook used to manage **complex state logic** inside **functional components**. It is conceptually similar to **Redux**. i.e, Instead of di...
The `useReducer` hooks works similarly to Redux, where: * You define a **reducer function** to handle state transitions. * You dispatch actions to update the state. **Cou...
Yes, it's common to combine **useReducer** with **useContext** to build a lightweight state management system similar to Redux: ```js const AppContext = React.createConte...
**Redux Toolkit (RTK)** is the official, opinionated way to write Redux logic today. It's built on top of plain Redux and re-exports its APIs, but wraps them with utiliti...
By default, `useSelector` re-renders a component whenever the **selected value's reference** changes between renders (it uses strict `===` comparison). Most unnecessary r...
`createSelector` (from **Reselect**, which Redux Toolkit re-exports) creates **memoized selectors**. It takes one or more "input selectors" and a "result function", and o...
**Normalized state** stores data the way a relational database would: each type of entity is kept in a lookup table keyed by ID, instead of being nested/duplicated inside...
**Middleware** provides a way to extend Redux with custom logic that runs **between dispatching an action and the moment it reaches the reducer**. It's the standard exten...
Middleware is written as **three nested (curried) functions**: ```javascript const exampleMiddleware = (store) => (next) => (action) => { // store => { getState, dispatch...
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