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<!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 str = 'Hello, world!'; let output = ''; if (str.startsWith('H')) { output = 'The string starts with "H".'; } else { output = 'The string does not start with "H".'; } return ( <div className='container'> <h3>React Js String startsWith() Method - Checking if a string starts with a letter</h3> <p>{output}</p> </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; } </style> </body> </html>