HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery .hasClass selected</title>
  <style>
    p { margin: 8px; font-size: 16px; font-family: sans-serif; }
    .selected { color: red; }
    #results { font-family: monospace; margin-top: 12px; }
  </style>
</head>
<body>
  <p>This paragraph is black and is the first paragraph.</p>
  <p class="selected">This paragraph is red and is the second paragraph.</p>
  <div id="results">
    <p>First paragraph has selected class: <span id="result1"></span></p>
    <p>Second paragraph has selected class: <span id="result2"></span></p>
    <p>At least one paragraph has selected class: <span id="result3"></span></p>
  </div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#result1").append($("p").first().hasClass("selected").toString());
    $("#result2").append($("p").last().hasClass("selected").toString());
    $("#result3").append($("p").hasClass("selected").toString());
  </script>
</body>
</html>

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jQuery .hasClass('selected') — official demo (Try It)