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excel how to return a result from a VBA function
'In VBA, you assign the return value to the name of the function.
'This is different from many languages that use the 'return' keyword:
Function Yesterday() As Date
Yesterday = Date() - 1
End Function
'VBA functions can be called from other VBA code:
d = Yesterday
'But VBA functions can also be called directly from an Excel
'worksheet if the function is placed in a VBA standard code module.
'In this context, a VBA function is referred to as an Excel
'User Defined Function (UDF) for the workbook.
'For example, enter the following formula in cell A1:
=Yesterday()
'If the function returns an object instead of an intrinsic
'data type then the Set keyword is required for the assignment:
Function NewDictionary()
Set NewDictionary = CreateObject("Scripting.Dictionary")
End Function
'And you must use Set when calling the function as well:
Set MyDic = NewDictionary
'VBA functions that return objects cannot be used as
'UDFs in a worksheet, with one exception. If the function
'returns a Range object, it can be used as a UDF.
'------------------------------------------------------------------
'Notes: In many programming languages, a function terminates
' execution when the 'return' keyword is encountered.
' VBA is different. Execution continues beyond the value
' assignment to the function name... until the last line
' of the function is reached... or until an
' 'Exit Function' statement is encountered.
' The function Name can be used as a variable
' inside the function as in this recursive function:
Function Factorial(n)
Select Case n
Case Is < 2: Factorial = 1
Case Else: Factorial = n * Factorial(n - 1)
End Select
End Function
' However, it is not always a great idea to use the function
' name as a variable. It can be confusing in longer functions
' and it has limitations. If the function is designed to return
' a dynamic array and the function code attempts to ReDim the
' function name, an compile-time error is raised.
' As a side note, VBA can access hundreds of Excel's built-in
' worksheet functions. Here are three ways to access
' the native FACT() worksheet function from VBA:
MsgBox [FACT(7)]
MsgBox Evaluate("FACT(" & 7 & ")")
MsgBox WorksheetFunction.Fact(7)
Source: docs.microsoft.com
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