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<head>
  <meta charset="utf-8">
  <title>Lodash _.update - uppercase city</title>
</head>
<body>
  <h1>_.update - uppercase city</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var user = {
        name: "John",
        address: { city: "New York", country: "USA" }
      };
      _.update(user, "address.city", function (city) {
        return city.toUpperCase();
      });
      var lines = [
        "address.city: " + user.address.city,
        "",
        "full user:",
        JSON.stringify(user, null, 2)
      ];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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