HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery .map() checkbox IDs</title>
</head>
<body>
  <form>
    <label><input type="checkbox" id="two" value="2" checked> 2</label><br>
    <label><input type="checkbox" id="four" value="4" checked> 4</label><br>
    <label><input type="checkbox" id="six" value="6" checked> 6</label><br>
    <label><input type="checkbox" id="eight" value="8" checked> 8</label>
  </form>
  <p id="out"></p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var ids = $(":checkbox").map(function () {
      return this.id;
    }).get().join();
    $("#out").text("IDs: " + ids);
  </script>
</body>
</html>

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jQuery .map() checkbox IDs (Try It)