Q271. How does ReactJS work behind the scenes?
ReactJS is a powerful JavaScript library for building user interfaces. While it appears simple on the surface, React performs a lot of complex operations behind the scene...
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Q272. How is `useReducer` Different from `useState`?
There are notable differences between `useState` and `useReducer` hooks. | Feature | `useState` | `useReducer` | |-----------------------|--------------------------------...
Q273. What is useContext? What are the steps to follow for useContext?
The `useContext` hook is a built-in React Hook that lets you access the value of a context inside a functional component without needing to wrap it in a component. It hel...
Q274. What are the use cases of useContext hook?
The `useContext` hook in React is used to share data across components without having to pass props manually through each level. Here are some common and effective use ca...
Q275. When to use client and server components?
You can efficiently build nextjs application if you are aware about which part of the application needs to use client components and which other parts needs to use server...
Q276. What are the differences between page router and app router in nextjs?
Next.js provides two different routing systems: the **Page Router** (traditional) and the **App Router** (introduced in Next.js 13). The App Router is built on React Serv...
Q277. Can you describe the useMemo() Hook?
The `useMemo()` Hook in React is used to **optimize performance** by **memoizing the result of expensive calculations**. It ensures that a function is **only re-executed ...
Q278. Can Hooks be used in class components?
No, Hooks cannot be used inside class components. They are specially designed for function components. This is because hooks depend on the sequence in which they are call...
Q279. What is an updater function? Should an updater function be used in all cases?
An **updater function** is a form of `setState` where you pass a **function** instead of a direct value. This function receives the **previous state** as an argument and ...
Q280. Can useState take a function as an initial value?
Yes, `useState` can take a function as an initial value, and this is a useful feature in React called **lazy initialization**. This function is also known as **initialize...