isNan w/ Array.

[LearningCoder]

Hi there, I am currently messing around with a code that I made previously. It's a very simple code, and what I am looking to do is access the array elements (which do a calculation). I can access the elements fine and display the results, but I am looking to 'validate' the prompt box using 'isNan' but since I have changed my code, only the prompt box shows but no alert message.

Here is my code:

<script type="text/javascript">
 
 var degFahren = prompt("Enter the degrees in Fahrenheit", 50); 
 var degCent;
 var myArray = new Array();
  
 myArray[0] = 0;
 myArray[1] = 1;
 myArray[2] = 2;
 myArray[3] = 3;
 myArray[4] = 4;
 myArray[5] = 5;
 myArray[6] = 6;
 myArray[7] = 7;
 myArray[8] = 9;
 myArray[9] = 32;
 
 degCent = myArray[5] / myArray[8] * (degFahren - myArray[9]);
 
 
 while (isNan(degFahren) == true)
 {
 alert("You did not enter a number");
 }
 while (isNan(degFahren) == false)
 {
 alert("\xB0" + degFahren + " Fahrenheit is \xB0" + degCent + " Centigrade.");
 }
 
 
 
 </script>

If anyone could please give me any information I will be very thankful, it's been racking my brains all night!

Thank you in advance.

[jscheuer1]

There could be other problems but there is no isNan() method. It's isNaN()