excel vba test or check if sheet exists

'VBA function to test if a sheet exists in the active workbook:

Function IsSheet(n$) As Boolean
    IsSheet = Not IsError(Evaluate(n & "!a1"))
End Function

'-----------------------------------------------------------------------

'Same thing, different technique:

Function IsSheet(n$) As Boolean
    On Error Resume Next
    IsSheet = Sheets(n).Index
End Function