What is default in VBA passing arguments to procedures?

You can pass arguments to a procedure (function or sub) by reference or by value. By default, Excel VBA passes arguments by reference.

How do you define optional parameters in VBA?

When you declare a parameter as being optional you must always define its default value. Any optional arguments will contain their default values if they are not explicitly passed in. If you have an optional “Variant” argument you can use the ISMISSING function to test if a value has been passed in or not.

What is the difference between function and sub in VBA?

VBA Sub vs Function: Key Differences A sub performs a task but does not return a value. A function returns a value of the tasks performed. Subs can be recalled from anywhere in the program and in multiple types. Functions are called by a variable.

How do you use optional parameters?

The following rules apply:

  1. Every optional parameter in the procedure definition must specify a default value.
  2. The default value for an optional parameter must be a constant expression.
  3. Every parameter following an optional parameter in the procedure definition must also be optional.

How do you add an optional parameter?

By Params Keyword: You can implement optional parameters by using the params keyword. It allows you to pass any variable number of parameters to a method. But you can use the params keyword for only one parameter and that parameter is the last parameter of the method.

How do you pass parameters in Excel macros?

To assign a macro that you pass arguments to a button, shape, image, or any object, you first right-click that object and click Assign Macro and then type the name of the macro and the argument, following the pattern described in the above examples, and then click OK.

How do you call a sub function in VBA?

How to Call Sub in VBA

  1. Design the user interface and set the properties for the user controls.
  2. Add the subroutine.
  3. Write the click event code for the command button that calls the subroutine.
  4. Test the application.

What is default ByVal or ByRef?

Visual Studio hides ByVal from you most of the time. It’s hidden because ByVal is the default when you’re passing variables over to a function or Sub. ByRef is the alternative. This is short for By Reference. This means that you are not handing over a copy of the original variable but pointing to the original variable.