How to use IsArray function in VBA?

The `IsArray` function in VBA (Visual Basic for Applications) is used to determine whether a variable is an array. It returns a Boolean value: `True` if the variable is an array; otherwise, it returns `False`.

Here’s how you can use the `IsArray` function:

First, open your VBA editor by pressing `ALT` + `F11` in Excel.
Next, either create a new module by right-clicking on any of the items in the Project Explorer and choosing `Insert > Module`, or just use an existing code window.
You can now write your VBA code using the `IsArray` function.

Here’s an example of using the `IsArray` function:

Sub CheckIfArray()
    Dim notArray As Integer
    Dim isArray As Variant
    
    notArray = 10
    isArray = Array(1, 2, 3, 4, 5)
    
    ' Check if notArray is an array
    If IsArray(notArray) Then
        MsgBox "notArray is an array"
    Else
        MsgBox "notArray is not an array"
    End If
    
    ' Check if isArray is an array
    If IsArray(isArray) Then
        MsgBox "isArray is an array"
    Else
        MsgBox "isArray is not an array"
    End If
End Sub

If you run this code, you’ll see two message boxes. The first one will tell you that `notArray` is not an array, and the second one will tell you that `isArray` is an array.

Remember that in VBA, an array could either be a static array (where the size is defined at compile time) or a dynamic array (where the size can be set or changed during runtime). The `IsArray` function works for both of these types of arrays. Moreover, the function checks only if the variable is of array data type; it does not verify whether the array has been initialized or not.

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