screen_rotation
Copied to Clipboard
<!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> <script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.2/umd/react.development.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.2/umd/react-dom.development.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script> </head> <body> <div id="app"></div> <script type="text/babel"> const { useState, useEffect } = React; function App() { const [myArray, setMyArray] = useState(['apple', 'banana', 'cherry']); const addItemToBeginning = () => { const newArray = [...myArray]; // create a copy of the original array newArray.unshift('orange'); // add the new element to the beginning of the copied array setMyArray(newArray); // update the state with the modified array }; return ( <div className='container'> <h3>React Js unshift() Method</h3> <button onClick={addItemToBeginning}>Add Item to Beginning</button> <ul> {myArray.map((item, index) => ( <li key={index}>{item}</li> ))} </ul> </div> ); } ReactDOM.render(<App />, document.getElementById('app')); </script> <style> .container { width: 600px; margin: 0 auto; box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24); padding: 20px; } h3 { margin-top: 0; font-size: 24px; color: #333; } button { padding: 10px 20px; font-size: 16px; color: #fff; background-color: #007bff; border: none; border-radius: 4px; cursor: pointer; transition: background-color 0.3s ease; } button:hover { background-color: #0056b3; } ul { margin-top: 20px; padding-left: 0; } li { list-style-type: none; padding: 10px 0; font-size: 18px; color: #333; border-bottom: 1px solid #ddd; } li:last-child { border-bottom: none; } </style> </body> </html>