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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