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  <title>Lodash _.assignIn — instance</title>
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  <h1>_.assignIn — class instance</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      function Source() {
        this.own = "from instance";
      }
      Source.prototype.inherited = "from prototype";
      var src = new Source();
      var lines = [];
      lines.push("assignIn -> " + JSON.stringify(_.assignIn({}, src)));
      lines.push("assign   -> " + JSON.stringify(_.assign({}, src)));
      document.getElementById("out").textContent = lines.join(String.fromCharCode(10));
    })();
  </script>
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Lodash _.assignIn — class instance with prototype keys (Try It)