VBScript Tutorials - Herong's Tutorial Examples - v6.03, by Herong Yang
"Function" Statement and Function Call
This section describes how to define and invoke a function procedure. Assigning a value to the procedure name in the function procedure sets the return value.
A "Function" statement defines a function procedure with the following syntax:
Function function_name(argument_list)
statement_block
function_name = return_value
End Function
where "function_name" is the name of the function, "argument_list" a list of variables used to pass data into and/or out of the function, and "return_value" is the value to be returned explicitly to the invoking statements.
Of course, "argument_list" is optional.
Assigning the return value to the function name is also optional. If not given, a default value will be returned to the invoking statements. But this is not recommended.
Invoking a function procedure is simple, no need of any special statements. Just use the function name with an argument list in any expression:
... function_name(argument_list) ...
This will cause the system to:
If you want terminate a function procedure early, you can use the "Exit" statement:
Exit Function
Table of Contents
Introduction of VBScript - Visual Basic Scripting Edition
Variant Data Type, Subtypes, and Literals
Numeric Comparison Operations and Logical Operations
String Operations - Concatenation and Comparison
Variable Declaration and Assignment Statement
Expression and Order of Operation Precedence
Statement Syntax and Statement Types
Array Data Type and Related Statements
Array References and Array Assignment Statements
Conditional Statements - "If ... Then" and "Select Case"
Loop Statements - "For", "While", and "Do"
►"Function" and "Sub" Procedures
►"Function" Statement and Function Call
"Sub" Statement and Subroutine Call
Sub (Subroutine) Procedure Example
Passing Arguments to Procedures
Example - Passing Arguments by Reference
Example - Passing Arguments by Value
Example - Variable Scope in Procedures
Inspecting Variables Received in Procedures
Error Handling Flag and the "Err" Object
Regular Expression Pattern Match and Replacement
scrrun.dll - Scripting Runtime DLL Library
IE Web Browser Supporting VBScript