[Gmsh] how to get length of an extrude array

[Prakash Manandhar]

I am a newbie. Say I have the following:

h = 0.1;
out[] = Extrude {h,0,0} {
   Surface{1, 5, 14, 10}; Layers{10 }; Recombine;
};

How do I get the length of the out array.

Thanks, Prakash.
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