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  <title>Lodash _.update - toggle darkMode</title>
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  <h1>_.update - toggle darkMode</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var config = {
        theme: "light",
        options: { darkMode: false, animation: true }
      };
      _.update(config, "options.darkMode", function (mode) {
        return !mode;
      });
      var lines = [
        "options.darkMode before: false",
        "options.darkMode after: " + config.options.darkMode,
        "",
        "config:",
        JSON.stringify(config, null, 2)
      ];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
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