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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array join() — vs split</title>
</head>
<body>
  <h1>join() — inverse of split</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var original = "alpha,beta,gamma";
      var parts = original.split(",");
      var restored = parts.join(",");
      document.getElementById("out").textContent =
        JSON.stringify(parts) + "\n" +
        JSON.stringify(restored) + "\n" +
        String(restored === original);
    })();
  </script>
</body>
</html>

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JavaScript Array join() — split inverse (Try It)