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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"> const { useState, useEffect } = React; function App() { const array = [1, 2, 3, 4, 5, 3, 6, 7]; const specificIndex = 3; const searchElement = 3; const findFirstOccurrence = () => { const startIndex = array.indexOf(searchElement, specificIndex); return startIndex; }; return ( <div className='container'> <h3>React Js indexof() Method Example</h3> <p>Array: <span className='array'>{array.join(', ')}</span></p> <p>Specific Index: <span className='specific-index'>{specificIndex}</span></p> <p>Search Element: <span className='search-element'>{searchElement}</span></p> <p>First Occurrence Index: <span className='first-occurrence-index'>{findFirstOccurrence()}</span></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 } h3 { font-size: 20px; color: #333; margin-bottom: 10px; } .array { font-weight: bold; } p { margin: 10px 0; font-size: 18px; color: #555; } </style> </body> </html>