I thought we already had global constants?? I think they are called,
"Literals." ;-)
Bob S
> On Jun 7, 2022, at 24:18 , Mark Waddingham via use-livecode
> <use-livecode@lists.runrev.com> wrote:
>
> On 2022-06-01 19:54, Alex Tweedly via use-livecode wrote:
>>> Also, you'll be able to do things like:
>>> constant kPiBy2 = pi / 2
>>> constant kPiBy2Squared = kPiBy2 * kPiBy2
>>> constant kPiBy2String = format("%f", kPiBy2)
>>> local sPiMap = { "pi-by-2": kPiBy2, "pi-by-2-sq": kPiBy2Squared }
>> Very good. In fact, great !! Thank you!
>> Would you be ale to do something like
>> constant kPiMap = { ... as above ... }
>
> Yes - the initializers in both constant and local keywords are the same -
> both can use arbitrary constant expressions (any local properties are assumed
> to be the default values when evaluating).
>
>> And now I'll push my luck and ponder the possibility of 'global' constants.
>
> Haha...
>
>> OK - 'global constant' is likely counter to the scope concepts. But
>> perhaps they could be done as "write-once" variables, or as a more
>> general "write-protected' variable.
>> put 17 into gkMyMagicValue
>> writeprotect "gkMyMagicValue"
>> and any *subsequent* attempt to change the value would fail.
>
> How is that any better than putting something like this in a library or back
> script:
>
> function gkMyMagicValue
> return 17
> end gkMyMagicValue
>
> Including the global declaration its the same number of lines (indeed less,
> as you'd need to put a global declaration in every script which wanted to use
> said global constant...).
>
> Warmest Regards,
>
> Mark.
>
> --
> Mark Waddingham ~ m...@livecode.com ~ http://www.livecode.com/
> LiveCode: Everyone can create apps
>
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