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  <title>Lodash _.invoke - safety and batch</title>
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  <h1>_.invoke - safety &amp; batch comparison</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var partial = { name: "Bob" };
      var users = [
        { greet: function () { return "Hi from A"; } },
        { greet: function () { return "Hi from B"; } }
      ];
      var maybeLength = _.get(partial, "name.length");
      var guardedLength = typeof maybeLength === "function"
        ? _.invoke(partial, "name.length")
        : undefined;
      var lines = [
        "missing greet         : " + JSON.stringify(_.invoke(partial, "greet")),
        "name.toUpperCase()    : " + JSON.stringify(_.invoke(partial, "name.toUpperCase")),
        "guarded name.length   : " + guardedLength,
        "_.invoke on array     : " + JSON.stringify(_.invoke(users, "greet")),
        "_.invokeMap on array  : " + JSON.stringify(_.invokeMap(users, "greet"))
      ];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
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