Contents > Developing ColdFusion MX Applications > Reusing Code in ColdFusion Pages > Calling user-defined functions

Calling user-defined functions

User-defined functions (UDFs) let you create application elements in a format in which you pass in arguments and get a return a value. You can define UDFs using CFScript or the cffunction tag. The two techniques have several differences, of which the following are the most important:

• If you use the cffunction tag, your function can include CFML tags.
• If you write your function using CFScript, you cannot include CFML tags.

You use UDFs in your application pages as you use standard ColdFusion functions. You can create a function for an algorithm or procedure that you use frequently, and then use the function wherever you need the procedure.

As with custom tags, you can easily distribute UDFs to others. For example, the Common Function Library Project at http://www.cflib.org is an open-source collection of CFML user-defined functions.

Contents > Developing ColdFusion MX Applications > Reusing Code in ColdFusion Pages > Calling user-defined functions

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