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  <meta charset="utf-8">
  <title>Lodash isSet — new Set</title>
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<body>
  <h1>_.isSet — new Set instances</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var empty = new Set();
      var numbers = new Set([1, 2, 3]);
      document.getElementById("out").textContent =
        "empty: " + _.isSet(empty) + "\n" +
        "numbers: " + _.isSet(numbers);
    })();
  </script>
</body>
</html>

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Lodash _.isSet — empty & populated Set (Try It)