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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>isNumeric — vs isNaN</title>

</head>

<body>

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

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    (function () {

      document.getElementById("out").textContent = [

        'isNaN(""): ' + isNaN(""),

        '$.isNumeric(""): ' + $.isNumeric(""),

        "typeof NaN: " + typeof NaN,

        "$.isNumeric(NaN): " + $.isNumeric(NaN)

      ].join("\n");

    })();

  </script>

</body>

</html>

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jQuery.isNumeric() — vs isNaN (Try It)