React Js Get first index of item in array

<!DOCTYPE html>
<html>

<body>
    <div id="app"></div>
    <script type="text/babel">
        const { useState, useEffect } = React;
        function App() {
            const fruits = ['apple', 'banana', 'orange'];
            const [result, setResult] = useState('');
            const [searchElement, setSearchElement] = useState('apple');
            const [isElementExists, setIsElementExists] = useState(false);

useEffect(() => {
                checkElementExists(searchElement);
            }, [searchElement]);

return (
                <div className='container'>
                    <h3>React Js IndexOf() Method</h3>
                    <p className='array'>{fruits.join(', ')}</p>
                    <label>Search Element:</label>
                    <input
                        type='text'
                        value={searchElement}
                        onChange={(e) => setSearchElement(e.target.value)}
                    />
                    {isElementExists && <p>{result}</p>}
                    {!isElementExists && <p className='not-found'>{result}</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: 18px;
            margin-bottom: 10px;
        }

.array {
            font-size: 14px;
            margin-bottom: 20px;
        }

label {
            font-size: 14px;
            display: block;
            margin-bottom: 5px;
        }

input[type="text"] {
            padding: 8px 12px;
            font-size: 14px;
            border-radius: 5px;
            border: 1px solid #ccc;
            width: 100%;
            margin-bottom: 10px;
        }

p {
            font-size: 14px;
            margin-bottom: 10px;
        }

.not-found {
            color: red;
        }
    </style>
</body>

</html>