On 2016-04-28 03:31, Kay C Lan wrote:
If you do not understand what isn't 'variable' and what really gets
checked
at each iteration for each style of repeat then you are likely to see
some
unexpected results. On the other hand, if do understand what is really
going on, then you can modify x to your advantage in either case. As
for
tVar in the 'repeat for each' case, I believe Mark Waddingham has
cautioned
that although your scripts might currently work if you modify tVar mid
repeat, LC is NOT guaranteed to behave the same way in the future.
Prior to 7.0 modifying the target variable inside a repeat for each
would cause undefined behavior. i.e.
repeat for each item tItem in tList
delete any char of tList
end repeat
Was always a really bad idea.
From 7.0 onwards, this causes no problem as the engine takes a 'copy' of
the target variable at the start of the loop. (Note you only pay for
that copy when you mutate tList subsequently, and that mutation has no
effect on the repeat for each loop being performed).
Warmest Regards,
Mark.
--
Mark Waddingham ~ m...@livecode.com ~ http://www.livecode.com/
LiveCode: Everyone can create apps
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