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  <title>Lodash _.noop - optional hook</title>

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  <h1>_.noop optional success hook</h1>

  <pre id="out"></pre>

  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>

  <script>

    (function () {

      var logs = [];

      function fetchData(onSuccess) {

        onSuccess = onSuccess || _.noop;

        var data = { id: 1, name: "Ada" };

        onSuccess(data);

        return data;

      }

      fetchData();

      fetchData(function (user) { logs.push(user.name); });

      document.getElementById("out").textContent = logs.length

        ? logs.join("\n")

        : "(first call silent — noop hook)\nAda";

    })();

  </script>

</body>

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Lodash _.noop - optional hook (Try It)