<cffunction name="save"> <cfargument name="id" type="string" required="false" default="" /> <cfargument name="name" type="string" required="true" /> ...
<cfif len(id) GT 0>
What if "" is a valid valid for id? That's why encoding two pieces of information in one variable is bad practice (and why, for example, a function that returns an integer value should not reserve one value for 'error' when all other values are valid!).
You shouldn't base behavior on whether an argument has a default value but on whether or not the argument is truly present (in my opinion).
Regards, Sean
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