Functions with Parameters tutorial in JavaScript

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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, shrink-to-fit=no">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Functions with Parameters JavaScript</title>
    <script>
        function hello(fname = "Ram", lname = "Charan") {
            document.write("Hello, " + fname + " " + lname + "<br>");
        }
        function sum(a, b) {
            document.write(a + b + "<br>");
        }
        sum(34.87, 12.67);
        hello("Hello", "World");
        sum(20, 30);
    </script>
</head>

<body>
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