rcozens at pon.net
Mon Aug 26 09:54:22 EDT 2002
>>The global keyword is adopted from HyperCard 1.0, and has been a part of all
>>xTalk implementation since. How else would the engine know whether to treat
>>a variable as local or global without such a keyword?
>Presumably it would maintain a list and then every time you used a
>variable, it would have to check to see if it was in the list. But
>once you added a variable to the list, you would never have to add
>it again, which would be a nice feature.
That would mean every time one wrote a handler one would have to
check EVERY local variable name to make sure it was not on the global
list. This would include handlers in other people's stacks as well
as your own.
As an aside, just as Revolution has less need to use externals than
HyperCard, it also has less need to use global variables. One can
define local variables that are shared by all handlers in a script
and whose values persist until the stack is closed.
I was able to replace all globals in my original HyperCard library
design with locally-declared variables.
CCW, Serendipity Software Company
"And I, which was two fooles, do so grow three;
Who are a little wise, the best fooles bee."
from "The Triple Foole" by John Donne (1572-1631)
More information about the Use-livecode