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Implement demo
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‎.gitignore

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# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
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# dependencies
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/node_modules
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/.pnp
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.pnp.js
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# testing
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/coverage
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# production
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/build
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# misc
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.DS_Store
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.env.local
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.env.development.local
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.env.test.local
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.env.production.local
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npm-debug.log*
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yarn-debug.log*
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yarn-error.log*

‎README.md

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# react-list-virtualization-example
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Rendering long lists using virtualization with React
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## Documentation
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[https://www.cluemediator.com/rendering-long-lists-using-virtualization-with-react](https://www.cluemediator.com/rendering-long-lists-using-virtualization-with-react)
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## Quick Start
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Follow the below steps to run the project.
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1. Clone repository
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2. Run `npm i` command to install dependencies
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3. Execute `npm start` command to run the project
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## Output
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[![React Example](https://www.cluemediator.com/wp-content/uploads/2023/01/output-rendering-long-lists-using-virtualization-with-react-clue-mediator.gif)](https://www.cluemediator.com/rendering-long-lists-using-virtualization-with-react)
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**Follow us on [GitHub](https://github.com/cluemediator) for more update.**
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## Connect with us
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Website: [Clue Mediator](https://www.cluemediator.com)
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Like us on [Facebook](https://www.facebook.com/thecluemediator)
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Follow us on [Twitter](https://twitter.com/cluemediator)
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Join us on [Telegram](https://t.me/cluemediator)
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Subscribe us on [YouTube](https://www.youtube.com/ClueMediator)
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Follow us on [Instagram](https://www.instagram.com/clue_mediator)

‎package-lock.json

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‎package.json

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{
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"name": "react-list-virtualization-example",
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"description": "Rendering long lists using virtualization with React",
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"author": {
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"name": "Clue Mediator",
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"email": "[email protected]",
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"url": "https://www.cluemediator.com"
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},
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"version": "0.1.0",
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"private": true,
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"dependencies": {
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"react": "^18.2.0",
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"react-dom": "^18.2.0",
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"react-scripts": "5.0.1",
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"react-virtualized": "^9.22.3"
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},
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"scripts": {
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"start": "react-scripts start",
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"build": "react-scripts build",
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"test": "react-scripts test",
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"eject": "react-scripts eject"
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},
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"eslintConfig": {
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"extends": [
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"react-app",
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"react-app/jest"
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]
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},
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"browserslist": {
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"production": [
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">0.2%",
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"not dead",
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"not op_mini all"
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],
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"development": [
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"last 1 chrome version",
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"last 1 firefox version",
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"last 1 safari version"
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]
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}
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}

‎public/favicon.ico

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‎public/index.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<meta name="theme-color" content="#000000" />
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<meta
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name="description"
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content="Web site created using create-react-app"
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/>
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<link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
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<!--
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manifest.json provides metadata used when your web app is installed on a
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user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
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-->
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<link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
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<!--
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Notice the use of %PUBLIC_URL% in the tags above.
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It will be replaced with the URL of the `public` folder during the build.
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Only files inside the `public` folder can be referenced from the HTML.
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Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
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work correctly both with client-side routing and a non-root public URL.
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Learn how to configure a non-root public URL by running `npm run build`.
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-->
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<title>React App</title>
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</head>
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<body>
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<noscript>You need to enable JavaScript to run this app.</noscript>
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<div id="root"></div>
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<!--
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This HTML file is a template.
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If you open it directly in the browser, you will see an empty page.
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You can add webfonts, meta tags, or analytics to this file.
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The build step will place the bundled scripts into the <body> tag.
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To begin the development, run `npm start` or `yarn start`.
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To create a production bundle, use `npm run build` or `yarn build`.
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-->
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</body>
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</html>

‎public/logo192.png

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‎public/logo512.png

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‎public/manifest.json

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{
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"short_name": "React App",
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"name": "Create React App Sample",
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"icons": [
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{
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"src": "favicon.ico",
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"sizes": "64x64 32x32 24x24 16x16",
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"type": "image/x-icon"
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},
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{
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"src": "logo192.png",
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"type": "image/png",
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"sizes": "192x192"
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},
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{
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"src": "logo512.png",
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"type": "image/png",
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"sizes": "512x512"
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}
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],
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"start_url": ".",
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"display": "standalone",
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"theme_color": "#000000",
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"background_color": "#ffffff"
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}

‎public/robots.txt

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# https://www.robotstxt.org/robotstxt.html
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User-agent: *
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Disallow:

‎src/App.js

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import React from 'react';
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import { List } from 'react-virtualized';
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import { dataSet } from './utils';
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import Item from './Item';
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function App() {
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return (
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<div className="App">
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<h4>Rendering long lists using virtualization with React - <a href="https://www.cluemediator.com">Clue Mediator</a></h4>
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<List
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width={500}
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height={300}
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rowCount={dataSet.length}
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rowHeight={50}
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rowRenderer={Item}
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className='list-box'
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/>
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</div>
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);
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}
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export default App;

‎src/Item.js

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import React from 'react';
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import { dataSet } from './utils';
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const Item = ({
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key, // Unique key within array of rows
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index, // Index of row within collection
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isScrolling, // The List is currently being scrolled
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isVisible, // This row is visible within the List (eg it is not an overscanned row)
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style, // Style object to be applied to row (to position it)
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}) => {
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return (
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<div key={key} style={style} className='item'>
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Clue Mediator - {dataSet[index]}
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</div>
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);
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}
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export default Item;

‎src/index.css

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body {
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margin: 20px;
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font-family: Arial, Helvetica, sans-serif;
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}
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.list-box {
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border: 1px solid #ddd;
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border-radius: 4px;
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}
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.item {
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background-color: aliceblue;
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display: flex;
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align-items: center;
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padding-left: 10px;
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}
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.item:nth-child(even) {
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background-color: #efefef;
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}

‎src/index.js

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import React from 'react';
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import ReactDOM from 'react-dom/client';
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import './index.css';
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import App from './App';
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const root = ReactDOM.createRoot(document.getElementById('root'));
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root.render(
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<React.StrictMode>
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<App />
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</React.StrictMode>
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);

‎src/utils.js

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// List data as an array of strings
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export const dataSet = [...Array(100000).keys()].map(x => `Item ${x + 1}`);

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