RELEASE LiveCode 6.6 DP1

Peter Haworth pete at
Sun Feb 16 22:13:26 CET 2014

Thanks for the explanation Mark.

Been prowling around the web for information on assert and I think I'm
getting clearer on its use.  Seems like it's really meant to detect the
infamous "this should never happen" situation rather than expected errors.,
kinda like a switch default statement to show an error message because the
case statements covered all the theoretically possible options.

But then you said:

"I use asserts all the time in my real-world coding, and I welcome their
introduction to the LC world."

And here I was thinking I was writing real world code :-)

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On Sun, Feb 16, 2014 at 9:40 AM, Mark Wieder <mwieder at> wrote:

> Pete-
> Sunday, February 16, 2014, 9:11:23 AM, you wrote:
> > All valid points. I'm just not seeing any big advantages over using
> if/then
> > constructs, but I can see that being a personal preference.
> Well, one advantage of assert is that the parameters pinpoint exactly
> where the error occurred, making your debugging and logging tasks
> easier. You don't need a switch statement to see what type of problem
> and where it happened, the engine hands that to you, and you can log
> it, display it in an answer dialog, whatever you want.
> You can ship code with assert commands in place, as they should be
> harmless and only come into play if something fails. Then when you
> change code your tests will tell you if something's going to break.
> You also have an extra bug reporting mechanism on the client end of
> things: if something happens to break your code even though it passed
> your dev tests, you can pop up the same log information and the your
> users can relay that back to you.
> Granted you could do all this without an assert command in the engine,
> and we've done that for years, but this makes things easier, cleaner,
> and helps the engine team ensure that they can catch bugs before they
> release builds to us. I use asserts all the time in my real-world
> coding, and I welcome their introduction to the LC world.
> That said, I think the assert command is still in its infancy, as it
> won't catch things like
> assert 1 / 0
> --
> -Mark Wieder
>  ahsoftware at
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