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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery.uniqueSort() — merge pipeline</title>
</head>
<body>
  <nav>
    <a href="#home">Home</a>
    <a href="#about" class="footer-link">About</a>
  </nav>
  <footer>
    <a href="#about" class="footer-link">About (footer)</a>
    <a href="#contact" class="footer-link">Contact</a>
  </footer>
  <pre id="out"></pre>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    (function () {
      var nodes = $("nav a").get();
      $.merge(nodes, $(".footer-link").get());
      var merged = nodes.length;
      $.uniqueSort(nodes);
      $(nodes).addClass("tracked");
      document.getElementById("out").textContent =
        "Merged length: " + merged + "\nUnique length: " + nodes.length +
        "\nTracked class count: " + $(".tracked").length;
    })();
  </script>
</body>
</html>

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jQuery.uniqueSort() — merge pipeline (Try It)