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  <title>Lodash _.get - default vs null</title>
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  <h1>_.get - default fires only for undefined</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var flags = {
        email: null,
        retries: 0,
        notes: "",
        archived: false
      };
      var lines = [
        "email    (null)  : "  + JSON.stringify(_.get(flags, "email",    "default@example.com")),
        "retries  (0)     : "  + JSON.stringify(_.get(flags, "retries",  3)),
        "notes    (\"\")    : " + JSON.stringify(_.get(flags, "notes",    "n/a")),
        "archived (false) : "  + JSON.stringify(_.get(flags, "archived", true)),
        "missing          : "  + JSON.stringify(_.get(flags, "missing",  "default@example.com"))
      ];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
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Lodash _.get - default fires only for undefined (Try It)