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  <title>Lodash _.keys - excluded properties</title>
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  <h1>_.keys - excluded properties</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var hidden = Symbol("hidden");
      var proto = { inherited: true };
      var obj = Object.create(proto);
      obj.visible = 1;
      obj[hidden] = 2;
      Object.defineProperty(obj, "secret", {
        value: 3,
        enumerable: false
      });
      function printable(list) {
        return list.map(function (key) {
          return typeof key === "symbol" ? key.toString() : key;
        });
      }
      var lines = [
        "_.keys                 : " + JSON.stringify(printable(_.keys(obj))),
        "_.keysIn               : " + JSON.stringify(printable(_.keysIn(obj))),
        "Object.getOwnPropertyNames: " + JSON.stringify(printable(Object.getOwnPropertyNames(obj))),
        "Reflect.ownKeys        : " + JSON.stringify(printable(Reflect.ownKeys(obj)))
      ];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
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Lodash _.keys - inherited, non-enumerable and symbol keys (Try It)