MathGroup Archive 2004

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Functions with optional parameters

Hello everyone,

How can I create functions with optional parameters?  For example, a 
simple function to add two or three numbers:

addThem[a_,b_,c_]:=If[c is not empty, Sum[a,b,c],Sum[a,b]]

I'm not sure of the proper syntax to test whether c is null or empty.


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