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"> function App() { const numbers = [4, 9, 15, 2, 11, 7, 6]; function isPrime(num) { for (let i = 2, sqrt = Math.sqrt(num); i <= sqrt; i++) { if (num % i === 0) { return false; } } return num > 1; } const primeIndex = numbers.findIndex(isPrime); return ( <div className='container'> <h2>React js array findIndex() Method</h2> <h3>Array: {numbers.join(', ')}</h3> {primeIndex !== -1 ? ( <p>The index of the first prime number is {primeIndex}.</p> ) : ( <p>No prime numbers found in the array.</p> )} </div> ); } ReactDOM.render(<App />, document.getElementById('app')); </script> <style> .container { width: 400px; 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; } </style> </body> </html>