Creating User-Defined Functions; Creating Functions Using Cfscript; Creating Functions Using Tags - MACROMEDIA COLDFUSION MX 61-DEVELOPING COLDFUSION MX Develop Manual

You might call the function with argument names, as follows:
<cfoutput>
Interest: #TotalInterest(principal=Form.Principal, annualPercent=Form.Percent,
months=Form.Months)#
</cfoutput>

Creating user-defined functions

You can use tags or CFScript to create a UDF. Each technique has advantages and disadvantages.

Creating functions using CFScript

You use the
function
definitions have the following features and limitations:
•
The function definition syntax is familiar to anyone who uses JavaScript or most programming
languages.
•
CFScript is efficient for writing business logic, such as expressions and conditional operations.
•
CFScript function definitions cannot include CFML tags.
The following is a CFScript definition for a function that returns a power of 2:
<cfscript>
function twoPower(exponent) {
return 2^exponent;
}
</cfscript>
For more information on how to use CFScript to define a function, see
CFScript" on page

Creating functions using tags

You use the
cffunction
following features and limitations:
•
Developers who have a background in CFML or HTML, but no scripting or programming
experience will be more familiar with the syntax.
•
You can include any ColdFusion tag in your function definition. Therefore, you can create a
function, for example, that accesses a database.
•
You can embed CFScript code inside the function definition.
•
The
cffunction
to authorized users or specify how the function can be accessed.
The following code uses the
<cffunction name="twoPower" output=True>
<cfargument name="exponent">
<cfreturn 2^exponent>
</cffunction>
For more information on how to use the
functions using the cffunction tag" on page
statement to define the function in CFScript. CFScript function
198.
tag to define a UDF in CFML. The
tag provides attributes that enable you to easily limit the execution of the tag
cffunction
cffunction
tag to define the exponentiation function:
tag to define a function, see
cffunction
200.

Creating user-defined functions

"Defining functions in
tag syntax has the
"Defining
193