Engineer Sushil Kumar Sushil Kumar Profile
In React, the Virtual DOM (Document Object Model) is a lightweight copy of the actual DOM. The DOM represents the structure of the document rendered by a browser, and manipulating it directly can be inefficient and slow, especially when dealing with complex UI updates. Here’s how the Virtual DOM works …
React JS
July, 2024
February, 2024
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27 February
What is the difference between useMemo and useCallback?
useMemo and useCallback are both hooks provided by React that aim to optimize performance by memoizing values or functions, respectively. However, they serve different purposes: useMemo: useMemo is used to memoize the result of a computation. It’s particularly useful when you have a computation that is expensive and you want …
June, 2023
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25 June
React top 100 interview questions and answer
1.) What is React and how does it work? React is a JavaScript library for building user interfaces. It allows developers to create reusable UI components and efficiently update them when the underlying data changes. React uses a virtual DOM (Document Object Model) to optimize rendering performance by minimizing direct …
January, 2023
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10 January
Import is not working in React. Showing SyntaxError unexpected token ‘<'
Solution:- Go to Jest-config.js and put this command that is transformIgnorePatterns: ["<rootDir>/node_modules/(?![a-z])"], Save and Run it you program/application will work. Thank you.
September, 2022
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15 September
How to fetch API Data from API in React Using useEffect?
import React, { useState, useEffect } from "react"; // Use can use css from this file: import "./styles.css"; const url = "https://jsonplaceholder.typicode.com/posts"; function App() { const [userData, setUserData] = useState({}); const getUserData = async () => { const response = await fetch(url); const jsonData = await response.json(); setUserData(jsonData); }; useEffect(() …