Looping through All collections in VBA - vba

Question

I have a program where I create several different collections in VBA. After the program completes, I need to delete the records in each collection. I have been able to delete the collections statically with the following code:
Sub Empty_Collections()
Dim Count As Integer
Dim i As Long
Count = Managers.Count
For i = 1 To Count
Managers.Remove (Managers.Count)
Next i
Count = FS.Count
For i = 1 To Count
FS.Remove (FS.Count)
Next i
Count = Staff.Count
For i = 1 To Count
Staff.Remove (Staff.Count)
Next i
Count = Clusters.Count
For i = 1 To Count
Clusters.Remove (Clusters.Count)
Next i
End Sub
However, as I may add additional Collections in the future, is it possible to have code similar to this:
Dim Item As Collection
Dim Count As Integer
Dim i As Long
For Each Item In Worksheets
Count = Item.Count
For i = 1 To Count
Item.Remove (Item.Count)
Next i
Next

Answer 1

While I hesitate to create globals like this, here is a possible solution:
In the ThisWorkbook Excel Object, add the following:
Private pCollections As Collection
Public Property Get Collections() As Collection
If pCollections Is Nothing Then: Set pCollections = New Collection
Set Collections = pCollections
End Property
Public Property Set Collections(Value As Collection)
Set pCollections = Value
End Property
Public Sub AddCollection(Name As String)
Dim Coll As New Collection
Me.Collections.Add Coll, Name
End Sub
Public Sub EmptyCollections()
Dim Coll As Collection
For Each Coll In Me.Collections
EmptyCollection Coll
Next Coll
End Sub
Private Sub EmptyCollection(ByRef Coll As Collection)
Do While Coll.Count > 0
' Remove items from the end of the collection
Coll.Remove Coll.Count
Loop
End Sub
Then add and work with collections as follows:
' Add collections
' (without helper)
Dim Managers As New Collection
ThisWorkbook.Collections.Add Managers, "Managers"
' (with helper)
ThisWorkbook.AddCollection "FS"
ThisWorkbook.AddCollection "Staff"
ThisWorkbook.AddCollection "Clusters"
' Add items to collection
' (access collection via named key for ease-of-use)
ThisWorkbook.Collections("Managers").Add "Alice"
ThisWorkbook.Collections("Managers").Add "Bob"
' (or original reference if desired
Managers.Add "Carl"
Debug.Print Managers.Count ' => 3
Debug.Print ThisWorkbook.Collections("Managers").Count ' => 3
' Add collection later
ThisWorkbook.AddCollection "FutureCollection"
' Empty all collections
ThisWorkbook.EmptyCollections
This may be a little more complex than what you are looking for, but it has the advantage of adding collections to a central location so that they can all be emptied later.