ASP VBScript Function Procedures
By Stephen Bucaro
A procedure is a block of code that performs a task and can be referenced within
the program to perform that task. VBScript has two kinds of procedures: Subs and Functions.
The difference between a Sub and a function is that a function returns a value, while a Sub does not.
The purpose of a Function is to create a block of code that can be called by a reference
(it's name) and can perform a specific operation on arguments that are passed to it and
return the result to the calling code. You might want to place code in a Function in order
to organize your program, but usually because you want to perform the same Function multiple
times in your program.
Shown below is the structure of a function
Function functionName()
code statements
functionName = return value
End Function
A function returns a value by assigning the value to its name.
A function can take parameters as shown below.
Function functionName(parameter1, parameter2)
code statements
functionName = return value
End Function
If a function does not accept arguments, then it can perform its operation on, or using,
variables that are within its scope. A variable declared outside of any function or sub-procedure
has a global scope. A global variable can be accessed by any code, sub-procedure, or function,
and its value can be modified anywhere in the program flow.
Shown below is an example of a function
<%
Function addFunction(a, b)
addFunction = a + b
End Function
response.write(addFunction(9,6))
%>
This function calculates the sum of two numbers and returns the result.
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