index.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Debounce prototype in JS.</title>

    <style>
        input {
            display: block;
            padding: 10px;
            margin: 10px;
            width: 200px;
        }
    </style>
</head>

<body>

    <div>
        <p>Open Dev console and start typing something in input boxes and check console and network calls.</p>
        <input type="text" name="textView1" placeholder="Type here for Async demo..." onkeyup="fnForAsyncCall()">
        <input type="text" name="textView2" placeholder="Type here for Sync demo..." onkeyup="fnForSyncCall()">
    </div>
    <script src="index.js"></script>
</body>

</html>