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  <title>Lodash isUndefined — undefined &amp; void 0</title>
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  <h1>_.isUndefined — undefined &amp; void 0</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var unset;
      document.getElementById("out").textContent =
        "void0: " + _.isUndefined(void 0) + "\n" +
        "unset: " + _.isUndefined(unset) + "\n" +
        "literal: " + _.isUndefined(undefined);
    })();
  </script>
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Lodash _.isUndefined — undefined & void 0 (Try It)