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  <title>Lodash _.merge - deep merge with defaults</title>
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  <h1>_.merge - defaults &amp; overrides</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var defaults = {
        theme: { mode: "light", fontSize: 16 },
        features: { analytics: true, beta: false }
      };
      var overrides = {
        theme: { mode: "dark" },
        features: { beta: true },
        user: "ada"
      };
      var config = _.merge({}, defaults, overrides);
      var lines = [
        "config         : " + JSON.stringify(config, null, 2),
        "",
        "defaults.theme : " + JSON.stringify(defaults.theme),
        "(defaults are untouched because we merged into {})"
      ];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
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