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  <title>Lodash _.keysIn - inherited properties</title>
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  <h1>_.keysIn - inherited prototype properties</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      function Vehicle(make, model) {
        this.make = make;
        this.model = model;
      }
      Vehicle.prototype.start = function () {
        return "Starting the vehicle";
      };
      var car = new Vehicle("Toyota", "Camry");
      var lines = [
        "_.keys   : " + JSON.stringify(_.keys(car)),
        "_.keysIn : " + JSON.stringify(_.keysIn(car))
      ];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
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Lodash _.keysIn - inherited prototype properties (Try It)