In the past, there’s been so many times I needed to tell if an object was numeric. With the below function, it’s very easy to tell if an item is numeric.

 //return false if blank, null, undefined or NaN.
 function isNumeric(v) {
   if (v == null || v == undefined || v== '') {
      return false;
   }
                        
   return !isNaN(v) && isFinite(v);
 }

If your project is already using jQuery, you could always use jQuery.IsNumeric()