explorers’ club

Preface: This may be common knowledge and have several dozen posts on it, but since I found this out on my own, I figure I would post on it.

Now I am not what you call an ActionScript know-it-all. In fact, I learn something nearly everyday about AS3 and Flex. That’s why I love my job. So I ran into an issue where I was using isNaN expecting to get true. Various values were getting passed in but I wasn’t getting consistent results. Why?

Well part of that was that I was passing int(s) as values. I hadn’t initialized the var to anything. I just said var i:int; much like we might define var n:Number; and its initialized value would be the numerical equivalent to null which is NaN.

Little to my knowledge this was occuring:

var n:Number;
trace(isNaN(n)); //true, because the default value of a Number is NaN
var i:int;
trace(isNaN(i)); //false, because int defaults to 0, not NaN

Cool tip? I’d like to think so. Anywho…