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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>toPlainObject — spread</title>
</head>
<body>
  <h1>vs own-only copy</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    function Foo() { this.b = 2; }
    Foo.prototype.c = 3;
    var inst = new Foo();
    document.getElementById("out").textContent =
      JSON.stringify(Object.assign({}, inst)) + "\n" +
      JSON.stringify(_.toPlainObject(inst));
  </script>
</body>
</html>

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Lodash _.toPlainObject — vs spread (Try It)