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1 Answer
Samual Sam

The isNaN() function accepts a value and determines whether the given value is a number or not.If so, this method returns true else it returns false. You can also call this method using Number object.

Syntax

Its Syntax is as follows

isNAN(5655);

Example

Live Demo

<html>
   <head>
      <title>JavaScript Example</title>
   </head>
   <body>
      <script type="text/javascript">
        var result1 = parseFloat("Ef00A.D3");
        document.write(isNaN(result1));
        document.write('<br>');
        var result2 = Math.log("welcome");
        document.write(isNaN(result2));
        document.write('<br>');
        var result3 = Math.log(1254);
        document.write(isNaN(result3));
      </script>
   </body>
</html>

Output

true
true
false

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