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<head>
  <meta charset="utf-8">
  <title>isFunction — non-functions</title>
</head>
<body>
  <h1>Non-functions</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    document.getElementById("out").textContent =
      "{}: " + _.isFunction({}) + "\n" +
      "string: " + _.isFunction("fn") + "\n" +
      "null: " + _.isFunction(null) + "\n" +
      "Math: " + _.isFunction(Math);
  </script>
</body>
</html>

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Lodash _.isFunction — non-functions (Try It)