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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>isSymbol — boxed</title>
</head>
<body>
  <h1>Boxed Symbol object</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var boxed = Object(Symbol("x"));
    document.getElementById("out").textContent =
      _.isSymbol(boxed) + "\n" +
      (typeof boxed === "symbol");
  </script>
</body>
</html>

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Lodash _.isSymbol — boxed Symbol (Try It)