HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>jQuery .removeClass callback</title>

  <style>

    li { padding: 8px 12px; margin: 4px 0; list-style: none; max-width: 220px; border: 1px solid #cbd5e1; }

    .alpha { background: #dbeafe; }

    .beta { background: #dcfce7; }

    .gamma { background: #fef3c7; }

  </style>

</head>

<body>

  <ul>

    <li class="alpha">First</li>

    <li class="beta">Second (penultimate)</li>

    <li class="alpha beta gamma">Last — click to sync with prev</li>

  </ul>

  <p style="color:#64748b;font-size:14px;">Callback removes classes matching the previous li.</p>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    $("li").last().removeClass(function() {

      return $(this).prev().attr("class");

    });

  </script>

</body>

</html>

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jQuery .removeClass(function) — copy prev class (Try It)