On 16/02/2015 21:15, Peter M. Brigham wrote:
As I now understand it, the really big difference is between the repeat for
n = 1 to… form on the one hand, and the repeat for each… and repeat n times
forms. The latter 2 are not that different, but when the engine has to
count lines/items every time, it slows things down a very significant
amount.
But the point is that the difference isn't in the form of the repeat loop,
it's in the chunking.
put line x of tMyBigText
is slow (if x is large) because the engine has to count from the start of
tMyBigText every time this is executed. If you do it once, it's not very
significant; if you do it thousands of times it might be.
But the point I'm trying to make is that that's not about the repeat loop,
it's about the chunking.
repeat with i=1 to 100
put not(x) into x
end repeat
will probably be insignificantly _faster_ than
repeat for each line t in tListOf100lines
put not(x) into x
end repeat
What makes a difference is the code inside the loop. If the main purpose of
your loop is to iterate over every chunk of a container, then there's a
special loop form optimised for that purpose ('repeat for each'). But it's
not that 'repeat for each' is inherently faster than 'repeat with'. It's that
repeat for each line t in tListOf100lines
is faster than
repeat with i = 1 to 100
put line i of tListOf100lines into t
Ben
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