Microsoft Office

Creating Custom Worksheet
Functions
As mentioned in the preceding chapter, you can create two types of VBA
procedures: Sub procedures and Function procedures. This chapter
focuses on Function procedures.
Overview of VBA Functions
Function procedures that you write in VBA are quite versatile. You can use these
functions in two situations:
n You can call the function from a different VBA procedure.
n You can use the function in formulas that you create in a worksheet.
This chapter focuses on creating functions for use in your formulas.
Excel contains hundreds of predefined worksheet functions. With so many from
which to choose, you may be curious as to why anyone would need to develop
additional functions. The main reason is that creating a custom function can
greatly simplify your formulas by making them shorter, and shorter formulas are
more readable and easier to work with. For example, you can often replace a
complex formula with a single function. Another reason is that you can write
functions to perform operations that would otherwise be impossible.
This chapter assumes that you’re familiar with entering and
NOTE
editing VBA code in the Visual Basic Editor (VB Editor). Refer
to Chapter 39 for an overview of the VB Editor.
IN THIS CHAPTER
Overview of VBA functions
About function procedures
Function procedure arguments
Debugging custom functionsy
Pasting custom functions
703