Hello, everyone!

First time poster, here.  I'm pretty new to JS, in general, and OpenLayers, 
particularly, but I'm really enjoying it so far. 

I am curious if anyone has done something like what I am trying to do.  My goal 
is to allow a user to select any two variables by means of a form.  These 
variables could be, say, the number of people in Texas, by county, from 1991 to 
1999.   The goal is then to create a new variable, Var3, where Var3 = (Var1 - 
Var2) and then style  the entire map based on the value of Var3.  (Each 
variable would obviously represent an attribute of the layer) I have got 
everything down except how to build a style based on the value of a derived 
variable.  Any advice?

Thanks!

Dheeraj
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