Not Logical Is VBScript

Why VBScript Logical Operators Aren't

Gadgetopia — Fri, 16 Jul 2004 00:34:00 GMT

If you've ever lost a monitor to VBScript (from frustrated punching, mine has dents), Eric Lippert provides some solace in that there's at least a reason why it behaves that way. In JScript you can do something like this: if...

re: Not Logical Is VBScript

Nicholas Allen — Fri, 16 Jul 2004 01:35:00 GMT

People might find more about how this works under "short circuit evaluation" instead of "lazy logic". Interestingly, if you're feeling lucky about "short circuit evaluation" you might end up on the KB article discussing this change in VB.NET.

re: Not Logical Is VBScript

mike — Fri, 16 Jul 2004 03:14:00 GMT

Eric, what's your suggestion as an alternative for something like:

If (Not Blah Is Nothing) And (Blah.Frob = 123) Then

Nested Ifs?

re: Not Logical Is VBScript

Eric Lippert — Fri, 16 Jul 2004 04:25:00 GMT

Right -- in VB.NET you can say If Blah AndAlso Foo Then ... and it will do short-circuit evaluation. In VBScript and VB6, you're stuck with nested statements.

re: Not Logical Is VBScript

Mike Schinkel — Fri, 16 Jul 2004 05:28:00 GMT

>> What's going on is that VBScript is not logical. VBScript is bitwise.

So does that mean is someone is not being logical, they are being bitwise? And conversely, that if they are being logical they are definitely not being bitwise?

>> Conditional statements should always take Booleans. Or, in other words, use Booleans as Booleans, use nothing else as Booleans.

Well, duuuuh! Oh, sorry, I forgot there are also C-language types in this world. :)

re: Not Logical Is VBScript

Eric Lippert — Fri, 16 Jul 2004 14:43:00 GMT

> So does that mean is someone is not being logical, they are being bitwise

That's a very bitwise question.

re: Not Logical Is VBScript

Zac — Fri, 16 Jul 2004 19:26:00 GMT

Personally, I like being a bit foolish type.

Oh, the ironicity...

re: Double Negatives

The Daily WTF — Tue, 27 Jul 2004 12:24:00 GMT

re: Not Logical Is VBScript

JoNo — Thu, 22 Mar 2007 21:28:44 GMT

Genius!!!!!

You saved me from growing gray hair!

Thx,

re: Not Logical Is VBScript

Klas Minnbergh — Mon, 23 Apr 2007 12:58:52 GMT

Howcome the god of order (EL) rules over the domain of chaos (vbscript)?

If bPigsCanFly = False, I get Error: 0x8004100A on Line 79 | keyongtech

If bPigsCanFly = False, I get Error: 0x8004100A on Line 79 | keyongtech — Thu, 22 Jan 2009 05:07:01 GMT

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