How to use IsObject function in VBA?

The `IsObject` function in VBA (Visual Basic for Applications) is used to determine if a variable is an object type. The purpose of the `IsObject` function is to avoid run-time errors that might occur if you try to perform an object-specific operation on a non-object.

Here is how you can use the `IsObject` function in VBA:

Sub CheckIfObject()
    Dim potentiallyAnObject As Variant
    Dim regularVariable As Integer
    
    ' Assign a new Collection (which is an object) to the variant
    Set potentiallyAnObject = New Collection
    
    ' Check if potentiallyAnObject is an Object
    If IsObject(potentiallyAnObject) Then
        MsgBox "potentiallyAnObject is an object"
    Else
        MsgBox "potentiallyAnObject is not an object"
    End If
    
    ' regularVariable is not an object, it's an integer
    regularVariable = 10
    If Not IsObject(regularVariable) Then
        MsgBox "regularVariable is not an object"
    End If
End Sub

Open the VBA editor by pressing `ALT+F11` in Excel, Word, or any other VBA-hosting application.
Insert a new module or use an existing one to write your VBA code.
Type a subroutine or function, where you would like to check if a variable is an object. Example:

What is happening here:

We declare two variables, `potentiallyAnObject` as `Variant` which can hold both object and non-object types and `regularVariable` as `Integer` which can hold numbers.
We create a `New Collection` (a collection is a type of object in VBA) and assign it to the `potentiallyAnObject` variable.
We then use `IsObject` to check if `potentiallyAnObject` is indeed an object. Since we have assigned a `Collection` object to it, the message box will confirm that it is an object.
For the `regularVariable`, which is not an object, `IsObject` will return `False`.

You can call the subroutine `CheckIfObject` by pressing `F5` while in the editor or by attaching it to a button or event in your application.

Remember that `IsObject` only checks if the variable is an object; it does not verify the type of the object. If you need to ensure that an object is of a specific type, you would need to use `TypeName` or `TypeOf`.

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