Assume I have a block of data in Excel 2010, 100 rows by 3 columns.
Column C contains some duplicates, say it starts off as
1, 1, 1, 2, 3, 4,
An improvement on @RBILLC and @radoslav006 answers, this version searches the array with the duplicates removed for existing values so it searchs less values to find a duplicate.
Public Function RemoveDuplicatesFromArray(sourceArray As Variant)
Dim duplicateFound As Boolean
Dim arrayIndex As Integer, i As Integer, j As Integer
Dim deduplicatedArray() As Variant
arrayIndex = -1
deduplicatedArray = Array(1)
For i = LBound(sourceArray) To UBound(sourceArray)
duplicateFound = False
For j = LBound(deduplicatedArray) To UBound(deduplicatedArray)
If sourceArray(i) = deduplicatedArray(j) Then
duplicateFound = True
Exit For
End If
Next j
If duplicateFound = False Then
arrayIndex = arrayIndex + 1
ReDim Preserve deduplicatedArray(arrayIndex)
deduplicatedArray(arrayIndex) = sourceArray(i)
End If
Next i
RemoveDuplicatesFromArray = deduplicatedArray
End Function