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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>assign — shallow</title>
</head>
<body>
  <h1>Shallow nested</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var nested = { x: 1 };
    var result = _.assign({}, { nested: nested });
    result.nested.x = 99;
    document.getElementById("out").textContent =
      "result.nested.x = " + result.nested.x + "\n" +
      "nested.x = " + nested.x;
  </script>
</body>
</html>

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Lodash _.assign — shallow nested (Try It)