VBA: How to Iterate Over a Dictionary and Update Values Based on Conditions Without Overwriting Existing Keys?
I'm collaborating on a project where This might be a silly question, but I'm currently working on a VBA script that utilizes a `Scripting.Dictionary` to keep track of some values that are fetched from a worksheet. The goal is to iterate over this dictionary and update values based on specific conditions, but I keep running into issues where existing keys seem to be getting overwritten unexpectedly. Here's a snippet of my code: ```vba Dim dict As Object Set dict = CreateObject("Scripting.Dictionary") ' Filling the dictionary with initial values With ThisWorkbook.Sheets("Data") Dim lastRow As Long lastRow = .Cells(.Rows.Count, 1).End(xlUp).Row Dim i As Long For i = 2 To lastRow If Not dict.Exists(.Cells(i, 1).Value) Then dict.Add .Cells(i, 1).Value, .Cells(i, 2).Value End If Next i End With ' Now updating the dictionary based on conditions Dim key As Variant For Each key In dict.Keys If dict(key) < 50 Then dict(key) = dict(key) + 10 ElseIf dict(key) >= 50 And dict(key) < 100 Then dict(key) = dict(key) * 1.1 End If Next key ' Debugging output For Each key In dict.Keys Debug.Print key & ": " & dict(key) Next key ``` The scenario I'm working with is that sometimes, when I update the dictionary, it seems to overwrite values that shouldn't change. For instance, if a key exists in the dictionary with a value of 40 and I run the update logic, I expect it to increment by 10, but in some cases, it appears to be updating incorrectly, or returning a type mismatch behavior on some iterations. I've checked to make sure that the data types are consistent, but I suspect something might be wrong with how I'm iterating or evaluating the conditions. I'm using Excel VBA with the reference to `Microsoft Scripting Runtime` for the dictionary. Can someone shed light on what might be going wrong, or suggest best practices for managing updates to a dictionary in this manner? I'm working on a service that needs to handle this. Am I missing something obvious?