Excel - Concatenate over a range

Excel Range Concatenate

Option Explicit

Public Function JoinText(cells As Variant,Optional delim_str As String) As String
    If cells.Columns.count < cells.Rows.count Then
       JoinText = Join(WorksheetFunction.Transpose(cells), delim_str)
    Else
       JoinText = Join(WorksheetFunction.Transpose(WorksheetFunction.Transpose(cells)), delim_str)
    End If
End Function