HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery .hasClass filter</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    li { padding: 6px 0; }
    li.done { color: #64748b; text-decoration: line-through; }
    button { margin: 8px 8px 8px 0; padding: 8px 14px; cursor: pointer; }
    #count { margin-top: 12px; font-weight: bold; }
  </style>
</head>
<body>
  <ul id="tasks">
    <li>Write tutorial</li>
    <li class="done">Review examples</li>
    <li>Publish page</li>
    <li class="done">Update sidebar</li>
  </ul>
  <button type="button" id="show-done">Show completed only</button>
  <button type="button" id="show-all">Show all</button>
  <p id="count"></p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    function updateCount() {
      var done = $("#tasks li").filter(function() {
        return $(this).hasClass("done");
      });
      $("#count").text("Completed tasks: " + done.length);
    }
    updateCount();
    $("#show-done").on("click", function() {
      $("#tasks li").hide();
      $("#tasks li").filter(function() {
        return $(this).hasClass("done");
      }).show();
    });
    $("#show-all").on("click", function() {
      $("#tasks li").show();
    });
  </script>
</body>
</html>

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jQuery .hasClass() — filter completed tasks (Try It)