Eric:
Excellent contribution!
:)
Jon
Eric Chatonet wrote:
Hi Christian,
Le 24 juin 05 à 10:21, Langers Christian a écrit :
Could you, please, give us (newbies/intermediate scriptesr) some
examples of fast/slow script code ?
They would be too many :-)
In fact, the problem is often more an architecture issue than a
simple code issue.
But here is one tiny trivial example among thousands to give you some
clues:
on CheckList
repeat with i = 1 to the number of lines of fld "List1"
set the itemDel to tab
put item 2 of line i of fld "List1" & cr after fld "List2"
end repeat
end CheckList
Main errors in the above 4 lines are:
manipulate data directly from a field (a lot of work for the engine)
use the "repeat with i" form slower than the "repeat for each" form
(especially noticeable with long lists)
force a screen redraw at each repetition (that's the must for slowing
down)
set the itemDel unnecessarily at each repetition
The result with 1000 lines: more than 13 seconds...
Better code:
on CheckList
local tList, tLine, tNewList
-----
put fld "List1" into tList
set the itemDel to tab
repeat for each line tLine in tList
put item 2 of tLine & cr after tNewList
end repeat
put tNewList into fld "List2"
end CheckList
manipulate data into a variable
use the "repeat for each" form
use one screen redraw only
set the itemDel only when needed
The result with 1000 lines: less than 20 milliseconds!
650 times faster...
Keep in mind that to answer correctly your request, this post should
be a 300 pages book :-)
May be Dan wrote it?
Best Regards from Paris,
Eric Chatonet.
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