Extract values from each cell to a separate sheet - excel

Question

I have a file with a few sheets, I need to extract values from each not empty cell into a column on another sheet.
Would be awesome if while doing that duplicates can be removed as well.
The following code infinitely loops. I don't see how to break the loop since all the events are being used in the body of the code.
Range where the cells are being looked for on both sheets are different, that is why I used .End(xlUp) to define the last row with values in cells.
I cannot use empty cells as a trigger for stopping the loop because there are empty cells between cells with values.
Sub updt()
Dim ws As Worksheet, currWs As Worksheet, Lng As Integer, rng As Range
Set ws = wb.Worksheets("Sheet1") 'the source sheet
Set currWs = Sheets("Sheet2") 'the destination sheet
Lng = ws.Cells(Rows.Count, 1).End(xlUp).Row
Set rng = ws.Range("A2:A" & Lng)
For Each c Lng rng
If WorksheetFunction.CountIf(currWs.Range("A:A"), c.Value) = 0 Then
currWs.Range("A" & currWs.Cells(Rows.Count, 1).End(xlUp).Row)(2) = c.Value
End If
Next
End Sub

Answer 1

Update Column With Unique Non-Existing Values From a Column of Another Worksheet Using a Dictionary
To avoid further complications, no arrays are used.
Option Explicit
Sub UpdateWorksheet()
' Reference the workbook.
Dim wb As Workbook: Set wb = ThisWorkbook ' workbook containing this code
' Reference the source worksheet, calculate the last row
' and reference the source column range.
Dim sws As Worksheet: Set sws = wb.Worksheets("Sheet1")
Dim slRow As Long: slRow = sws.Cells(sws.Rows.Count, "A").End(xlUp).Row
Dim srg As Range: Set srg = sws.Range("A2:A" & slRow)
' Reference the destination worksheet and calculate the last row.
Dim dws As Worksheet: Set dws = wb.Worksheets("Sheet2")
Dim dlRow As Long: dlRow = dws.Cells(dws.Rows.Count, "A").End(xlUp).Row
' Define a dictionary (object).
Dim dict As Object: Set dict = CreateObject("Scripting.Dictionary")
dict.CompareMode = vbTextCompare ' case-insensitive
' Declare variables.
Dim cCell As Range
Dim cKey As Variant
' Write the unique values from the destination column range
' to the dictionary.
If dlRow > 1 Then ' 1 means 'first row - 1' i.e. '2 - 1'
Dim drg As Range: Set drg = dws.Range("A2:A" & dlRow)
For Each cCell In drg.Cells
cKey = cCell.Value
If Not IsError(cKey) Then ' exclude error values
If Len(cKey) > 0 Then ' exclude blanks
dict(cKey) = Empty
End If
End If
Next cCell
End If
' Add the unique values from the source column range
' to the dictionary.
For Each cCell In srg.Cells
cKey = cCell.Value
If Not IsError(cKey) Then ' exclude error values
If Len(cKey) > 0 Then ' exclude blanks
dict(cKey) = Empty
End If
End If
Next cCell
' Check if the dictionary is empty.
If dict.Count = 0 Then
MsgBox "No valid values found.", vbCritical
Exit Sub
End If
' Clear the previous values from the destination first cell to the bottom
' of the worksheet.
Dim dCell As Range: Set dCell = dws.Range("A2")
With dCell
.Resize(dws.Rows.Count - .Row + 1).ClearContents
End With
' Write the unique values from the dictionary to the destination worksheet.
For Each cKey In dict.Keys
dCell.Value = cKey ' write
Set dCell = dCell.Offset(1) ' reference the cell below
Next cKey
' Inform.
MsgBox "Worksheet updated.", vbInformation
End Sub

Answer 2

You might want to use AdvancedFilter:
Option Explicit
Sub Copy_Advanced()
Dim ws As Worksheet, currWs As Worksheet, Lng As Integer, rng As Range
Set ws = Worksheets("Sheet1") 'the source sheet
Set currWs = Sheets("Sheet2") 'the destination sheet
Lng = ws.Cells(Rows.Count, 1).End(xlUp).Row
Set rng = ws.Range("A1:A" & Lng)
ws.Range("D1").Value = ws.Range("A1").Value
ws.Range("D2") = ">0"
ws.Range(rng.Address).AdvancedFilter Action:=xlFilterCopy, _
CriteriaRange:=ws.Range("D1:D2"), _
CopyToRange:=currWs.Range("A1"), _
Unique:=True
End Sub