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IsCustomFunction
Last update:
May 18, 2026
Description
Determines whether a name represents a custom function.
Returns
True, if name can be called as a custom function; False, otherwise.
Category
Function syntax
IsCustomFunction(name)Parameters
Parameter | Description |
name | Name of a custom function. Must not be in quotation marks. If not a defined variable or function name, ColdFusion generates an error. |
Usage
The IsCustomFunction function returns True for any function that can be called as a custom function, including functions defined using CFScript function declarations, CFScript function expressions, cffunction tags, and functions that are ColdFusion component methods. For CFC methods, first instantiate the component.
Note: To prevent undefined variable exceptions, always precede IsCustomFunction with an IsDefined test, as shown in the example.
For functions defined using function expressions, use isClosure().
Example
<cfscript>
// CustomFunction
function2 = function (sum) {};
writeoutput("Is it a customFunction: " & isCustomFunction(function2));
</cfscript>Output
Is it a customFunction: YES
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