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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery.merge() — order</title>
</head>
<body>
  <h1>Preserve order</h1>
  <pre id="out"></pre>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    (function () {
      var first = [3, 2, 1];
      $.merge(first, [4, 3, 2]);
      document.getElementById("out").textContent = JSON.stringify(first);
    })();
  </script>
</body>
</html>

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jQuery.merge() — preserve order (Try It)