Create dictionary of lists in vba - vba

Question

I have worked in Python earlier where it is really smooth to have a dictionary of lists (i.e. one key corresponds to a list of stuff). I am struggling to achieve the same in vba. Say I have the following data in an excel sheet:
Flanged_connections 6
Flanged_connections 8
Flanged_connections 10
Instrument Pressure
Instrument Temperature
Instrument Bridle
Instrument Others
Piping 1
Piping 2
Piping 3
Now I want to read the data and store it in a dictionary where the keys are Flanged_connections, Instrument and Piping and the values are the corresponding ones in the second column. I want the data to look like this:
'key' 'values':
'Flanged_connections' '[6 8 10]'
'Instrument' '["Pressure" "Temperature" "Bridle" "Others"]'
'Piping' '[1 2 3]'
and then being able to get the list by doing dict.Item("Piping") with the list [1 2 3] as the result. So I started thinking doing something like:
For Each row In inputRange.Rows
If Not equipmentDictionary.Exists(row.Cells(equipmentCol).Text) Then
equipmentDictionary.Add row.Cells(equipmentCol).Text, <INSERT NEW LIST>
Else
equipmentDictionary.Add row.Cells(equipmentCol).Text, <ADD TO EXISTING LIST>
End If
Next
This seems a bit tedious to do. Is there a better approach to this? I tried searching for using arrays in vba and it seems a bit different than java, c++ and python, with stuft like redim preserve and the likes. Is this the only way to work with arrays in vba?
My solution:
Based on #varocarbas' comment I have created a dictionary of collections. This is the easiest way for my mind to comprehend what's going on, though it might not be the most efficient. The other solutions would probably work as well (not tested by me). This is my suggested solution and it provides the correct output:
'/--------------------------------------\'
'| Sets up the dictionary for equipment |'
'\--------------------------------------/'
inputRowMin = 1
inputRowMax = 173
inputColMin = 1
inputColMax = 2
equipmentCol = 1
dimensionCol = 2
Set equipmentDictionary = CreateObject("Scripting.Dictionary")
Set inputSheet = Application.Sheets(inputSheetName)
Set inputRange = Range(Cells(inputRowMin, inputColMin), Cells(inputRowMax, inputColMax))
Set equipmentCollection = New Collection
For i = 1 To inputRange.Height
thisEquipment = inputRange(i, equipmentCol).Text
nextEquipment = inputRange(i + 1, equipmentCol).Text
thisDimension = inputRange(i, dimensionCol).Text
'The Strings are equal - add thisEquipment to collection and continue
If (StrComp(thisEquipment, nextEquipment, vbTextCompare) = 0) Then
equipmentCollection.Add thisDimension
'The Strings are not equal - add thisEquipment to collection and the collection to the dictionary
Else
equipmentCollection.Add thisDimension
equipmentDictionary.Add thisEquipment, equipmentCollection
Set equipmentCollection = New Collection
End If
Next
'Check input
Dim tmpCollection As Collection
For Each key In equipmentDictionary.Keys
Debug.Print "--------------" & key & "---------------"
Set tmpCollection = equipmentDictionary.Item(key)
For i = 1 To tmpCollection.Count
Debug.Print tmpCollection.Item(i)
Next
Next
Note that this solution assumes that all the equipment are sorted!

Answer 1

Arrays in VBA are more or less like everywhere else with various peculiarities:
Redimensioning an array is possible (although not required).
Most of the array properties (e.g., Sheets array in a Workbook) are 1-based. Although, as rightly pointed out by #TimWilliams, the user-defined arrays are actually 0-based. The array below defines a string array with a length of 11 (10 indicates the upper position).
Other than that and the peculiarities regarding notations, you shouldn't find any problem to deal with VBA arrays.
Dim stringArray(10) As String
stringArray(1) = "first val"
stringArray(2) = "second val"
'etc.
Regarding what you are requesting, you can create a dictionary in VBA and include a list on it (or the VBA equivalent: Collection), here you have a sample code:
Set dict = CreateObject("Scripting.Dictionary")
Set coll = New Collection
coll.Add ("coll1")
coll.Add ("coll2")
coll.Add ("coll3")
If Not dict.Exists("dict1") Then
dict.Add "dict1", coll
End If
Dim curVal As String: curVal = dict("dict1")(3) '-> "coll3"
Set dict = Nothing

Answer 2

You can have dictionaries within dictionaries. No need to use arrays or collections unless you have a specific need to.
Sub FillNestedDictionairies()
Dim dcParent As Scripting.Dictionary
Dim dcChild As Scripting.Dictionary
Dim rCell As Range
Dim vaSplit As Variant
Dim vParentKey As Variant, vChildKey As Variant
Set dcParent = New Scripting.Dictionary
'Don't use currentregion if you have adjacent data
For Each rCell In Sheet2.Range("A1").CurrentRegion.Cells
'assume the text is separated by a space
vaSplit = Split(rCell.Value, Space(1))
'If it's already there, set the child to what's there
If dcParent.Exists(vaSplit(0)) Then
Set dcChild = dcParent.Item(vaSplit(0))
Else 'create a new child
Set dcChild = New Scripting.Dictionary
dcParent.Add vaSplit(0), dcChild
End If
'Assumes unique post-space data - text for Exists if that's not the case
dcChild.Add CStr(vaSplit(1)), vaSplit(1)
Next rCell
'Output to prove it works
For Each vParentKey In dcParent.Keys
For Each vChildKey In dcParent.Item(vParentKey).Keys
Debug.Print vParentKey, vChildKey
Next vChildKey
Next vParentKey
End Sub

Answer 3

I am not that familiar with C++ and Python (been a long time) so I can't really speak to the differences with VBA, but I can say that working with Arrays in VBA is not especially complicated.
In my own humble opinion, the best way to work with dynamic arrays in VBA is to Dimension it to a large number, and shrink it when you are done adding elements to it. Indeed, Redim Preserve, where you redimension the array while saving the values, has a HUGE performance cost. You should NEVER use Redim Preserve inside a loop, the execution would be painfully slow
Adapt the following piece of code, given as an example:
Sub CreateArrays()
Dim wS As Worksheet
Set wS = ActiveSheet
Dim Flanged_connections()
ReDim Flanged_connections(WorksheetFunction.CountIf(wS.Columns(1), _
"Flanged_connections"))
For i = 1 To wS.Cells(1, 1).CurrentRegion.Rows.Count Step 1
If UCase(wS.Cells(i, 1).Value) = "FLANGED_CONNECTIONS" Then ' UCASE = Capitalize everything
Flanged_connections(c1) = wS.Cells(i, 2).Value
End If
Next i
End Sub