অ্যাঙ্গুলারজেএস merge

<!DOCTYPE html>
<html>
<body>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.8.3/angular.min.js"></script>
  <script>
    var user = {
      name: "আরিফ",
      address: {
        land: "বাংলাদেশ"
      }
    };

    var result = angular.merge({}, user, {
      age: 25,
      address: {
        city: "ঢাকা"
      }
    });

    document.write(result.name);
    document.write(result.address.land);
    document.write(result.address.city);
  </script>
</body>
</html>