JavaScript-Practice/map function.html at main · Jishaan-Azmi/JavaScript-Practice · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <title>Understand JS - Custom Map</title>
    <style>
        body {
            font-family: Arial;
            text-align: center;
            margin-top: 50px;
        }
        button {
            padding: 10px 20px;
            cursor: pointer;
        }
        #output {
            margin-top: 20px;
            font-size: 20px;
            color: green;
        }
    </style>
</head>
<body>

    <h1>Custom Map Function Demo</h1>
    <p>Click the button to double numbers</p>

    <button onclick="runMap()">Run</button>

    <div id="output"></div>

    <script>
        // Your custom map function
        function myMap(array, callback) {
            let result = [];

            for (let i = 0; i < array.length; i++) {
                result.push(callback(array[i], i, array));
            }

            return result;
        }

        function runMap() {
            const numbers = [1, 2, 3, 4];

            const doubled = myMap(numbers, function(num) {
                return num * 2;
            });

            document.getElementById("output").innerText = doubled.join(", ");
        }
    </script>

</body>
</html>