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<head>
  <meta charset="utf-8">
  <title>Lodash isFunction — declarations</title>
</head>
<body>
  <h1>_.isFunction — named and arrow</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      document.getElementById("out").textContent =
        "namedFn: " + _.isFunction(function bump(n) { return n + 1; }) + "\n" +
        "arrowFn: " + _.isFunction(() => 42);
    })();
  </script>
</body>
</html>

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Lodash _.isFunction — named and arrow (Try It)