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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>cloneDeep — flat</title>
</head>
<body>
  <h1>Flat object</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var source = { x: 1, y: 2 };
    var copy = _.cloneDeep(source);
    copy.x = 9;
    document.getElementById("out").textContent =
      "source.x: " + source.x +
      "\ncopy.x: " + copy.x;
  </script>
</body>
</html>

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Lodash _.cloneDeep — flat object (Try It)