VBA Prefer `If Len myString 0 Then` Over `If myString Then

When checking if a string is zero-length, it is better practice, and more efficient, to inspect the length of the string rather than comparing the string to an empty string.

Const myString As String = vbNullString
'Prefer this method when checking if myString is a zero-length string
If Len(myString) = 0 Then
 Debug.Print "myString is zero-length"
End If
'Avoid using this method when checking if myString is a zero-length string
If myString = vbNullString Then
 Debug.Print "myString is zero-length"
End If

Conclusion

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