flowscript string length

[Jeff Schmitz]

Using cocoon 2.1 I'm trying to get the length of a string in my  
flowscript code, but it always returns "undefined" instead of a number.

I've tried both of the below with the same results:
var part = "this is a test";

var last = part.length();

var last = part.length;

Do the string properties work in flowscript?

Thanks,
Jeff