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  <title>Lodash _.keysIn - class methods</title>
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<body>
  <h1>_.keysIn - ES class methods are hidden</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      class User {
        constructor(name) { this.name = name; }
        greet() { return "Hi " + this.name; }
      }
      var u = new User("Ada");
      var protoNames = Object.getOwnPropertyNames(Object.getPrototypeOf(u))
        .filter(function (name) { return name !== "constructor"; });
      var lines = [
        "_.keysIn(u)            : " + JSON.stringify(_.keysIn(u)),
        "prototype names (manual): " + JSON.stringify(protoNames)
      ];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
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Lodash _.keysIn - ES class methods are non-enumerable (Try It)