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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>isUndefined — missing</title>
</head>
<body>
  <h1>Missing props &amp; args</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var user = { name: "Ada" };
    function greet(name) {
      return _.isUndefined(name) ? "Guest" : name;
    }
    document.getElementById("out").textContent = [
      _.isUndefined(user.age),
      greet(),
      greet("Ada")
    ].join("\n");
  </script>
</body>
</html>

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Lodash _.isUndefined — missing props (Try It)