FullStackDev/nonrep_ele.html at main · 23Nash/FullStackDev · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>First Non-Repeating Character</title>
</head>
<body>
    <h1>First Non-Repeating Character</h1>
    <input type="text" id="inputString" placeholder="Enter a string">
    <button onclick="findNonRepeating()">Find</button>
    <p id="result"></p>

    <script>
        function findNonRepeating() {
            const str = document.getElementById('inputString').value;

            const charCount = new Map();

            for(let char of str) {
                charCount.set(char, (charCount.get(char) || 0) + 1);
            }

            let firstNonRepeating = null;
            for(let char of str) {
                if(charCount.get(char) === 1) {
                    firstNonRepeating = char;
                    break;
                }
            }

            const result = document.getElementById('result');
            if(firstNonRepeating) {
                result.textContent = `First non-repeating character: "${firstNonRepeating}"`;
            } else {
                result.textContent = "No non-repeating character found";
            }
        }
    </script>
</body>
</html>