1 more speed question

[Alex Tweedly]

Dave Cragg wrote:

> This, combined with the slight but consistent speed advantage of the  
> first method when referring to fields, makes me think we need some re- 
> confirmation of the notion that the "limit expression" in a repeat  
> loop is only evaluated once.


It is stated that way in the docs;  under repeat / with ...

> As with the for number times form described above, the startValue and 
> endValue are evaluated when the loop is first entered, and are not 
> re-evaluated as a result of any actions performed in the statementList.

which seems clear enough, though slightly loose ... it would be more 
correct to say that they are evaluated BEFORE the loop is entered... as 
shown by

> on mouseUp
>   repeat with i = 1 to func(i)
>     put ":" after msg
>   end repeat
> end mouseUp
>
> function func x
>   put "func" && x after msg
>   return 3
> end func
>
which results in

> func 0:::

showing that the limit expression was calculated before the loop was 
entered, (and also that it was only calculated once).


-- 
Alex Tweedly       http://www.tweedly.net



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