Sub Procedures

A subroutine procedure is a sequence of ViviFire statements between the lines Sub and End. The procedure does a task, then returns control to the code that called it, also known as the “caller”. The procedure can return a value to the caller.

Each time the procedure is called, its statements run. It starts with the initial statement after Sub and usually continues until End (or End Sub). But one of two statements can stop it: Exit Sub or Return.

You can use Sub in modules, classes, objects, and traits. It has private member access. Thus, it can be called only by other code in the same (1) class, (2) object, (3) trait, or (4) module.

A subroutine procedure can have arguments (constants, variables, or expressions) which the caller passes to it.

Declaration syntax

Sub sub_name [ parameter_list ]
    ' statements
End Sub

Parameter declaration

Parameters as local variables

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Calling syntax

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Example of declaration and call

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See also

• Sub Statement
• Function Procedures
• Method Procedures
• Property Procedures
• Lambda Expressions