With the introduction of ColdFusion 5 and user defined functions you’ll be seeing lots of new functions in ColdFusion code. So how to tell if a function is a BIF (Built In Function) or a UDF (User Defined Function)? Use the new IsCustomFunction() function, pass it a function name (not in quotes) and it’ll return True or False. (Applies to: ColdFusion 5 or later)

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