What is HOC (Higher-Order Component) in React?
Interview Answer A Higher-Order Component (HOC) is a function that takes a React component as…
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What is useContext ? When to use it ?
Interview Answer useContext() is a React Hook that allows components to access shared data from…
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What is GraphQL? How is it Different than Traditional HTTP REST API ?
Interview Answer GraphQL is a query language for APIs that allows clients to request exactly…
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What is Reconciliation in React?
Interview Answer Reconciliation is React’s process of comparing the previous Virtual DOM with the new…
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Difference Between useState() and useRef()
Feature useState() useRef() Causes Re-render ✅ Yes ❌ No Stores Data ✅ Yes ✅ Yes…
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Difference Between export default and export
Feature export default export (Named Export) Number per file Only 1 Multiple allowed Import name…
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How to Import & Export Multiple Variables from Same Files in JavaScript/React/Next.js
Interview Answer If I need to export multiple variables, functions, or components from the same…
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Difference between SSR & CSR ?
Interview Answer (Short) SSR (Server-Side Rendering) generates HTML on the server before sending it to…
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What is Code Splitting in React?
Code Splitting is a performance optimization technique where the JavaScript bundle is divided into smaller…
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Difference Between useMemo() and useCallback() ?
Interview Answer (Short) useMemo() is used to cache the result of an expensive computation and…