Using scripting to create expressions?

[David_Eastman]

I'm trying to automate the creation of a bunch of rather involved expressions.  Is it possible to write a script that creates an expression?  For example, can I write a script which sets the position property of a layer to "wiggle(5,10)"? 

And conversely, can a script access the source code of an existing expression?  If I look at the value of a layer that has a wiggle function, I just get the wiggle value, not the actual code generating those random values.

[Dan Ebberts · Accepted solution]

To set an expression:

myLayer.property("Position").expression = "wiggle(5,10)";

To retrieve an expression

var myExpr = myLayer.property("Position").expression;

Dan

[David_Eastman]

Awesome!  Thanks Dan.  I love your site, by the way.