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VBScript in a Nutshell, 2nd Edition by Ron Petrusha, Matt Childs, Paul Lomax

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Name

Function Statement

Syntax

[Public [Default] | Private] Function name [(arglist)] [(  )] 
   [statements]
   [name = expression]
   [Exit Function] 
   [statements]
   [name = expression]
End Function
Public

Use: Optional

Type: Keyword

Indicates that the function is accessible in all scripts. If used in a class, indicates that the function is a member of the class’s public interface. Public and Private are mutually exclusive; Public is the default.

Default

Use: Optional

Type: Keyword

Defines a method as the default member of a class. It is valid only for a public function defined within a Class...End Class statement. Only one property or method in a class block can be defined as the default member of the class.

Private

Use: Optional

Type: Keyword

Restricts access to the function to other procedures in the script where it is declared. If the function is a member of a class, it makes the function accessible only to other procedures in that class.

name

Use: Required

The name of the function.

arglist uses the following syntax and parts:

Use: Optional

A comma-delimited list of variables to be passed to the function as arguments from the calling procedure.

statements

Use: Optional

Program code to be executed within the function.

expression

Use: Optional

The value to return from the function to the calling procedure.

arglist uses the following syntax and parts:
[ByVal | ByRef] varname[( )]
ByVal

Use: Optional

Type: Keyword

The argument is passed by value; that is, the local copy of the variable is assigned the value of the argument. ...

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