Concat and Join Array tutorial in JavaScript

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<html lang="en">

<head>
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    <title>Concat Join Array JavaScript</title>
    <script>
        var a = ["Sanjay", "Aman", "Rehman"];
        var b = a.concat("Rahul", "Karan");
        document.write(b + "<br>");

        var c = ["Ronak", "Payal"];
        var d = ["Neha", "Mahima"];
        var e = c.concat(b, c, d);
        document.write(e + "<br><br>");
        var f = e.join(" / ");    //Here "f" will become a String, Not Array
        var g = e.join(" - ");    //Here "g" will become a String, Not Array
        document.write(f + "<br><br>");
        document.write(g);
    </script>
</head>

<body>
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