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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>set — return</title>
</head>
<body>
  <h1>set return value</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var object = { a: 1 };
    var same = _.set(object, "b", 2);
    document.getElementById("out").textContent = [
      String(same === object),
      JSON.stringify(object)
    ].join("\n");
  </script>
</body>
</html>

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Lodash _.set — returns same object (Try It)