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Re: Things I thought I knew, but didn't - variable scope in repeat loops
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Re: Things I thought I knew, but didn't - variable scope in repeat loops

  • Subject: Re: Things I thought I knew, but didn't - variable scope in repeat loops
  • From: Doug McNutt <email@hidden>
  • Date: Sat, 27 Dec 2008 10:48:40 -0700

Mark got quoted this way: 
 Applescript builds a list of values (or an iterator/generator) and
 sets i to the next value at the top of the loop; it doesn't look at
 the current value of i to determine what the next value of i should
 be.   So you can do anything you want to i inside the loop and it
 won't affect the loop control logic:

Doesn't that imply a limit on the number of times through a repeat loop? If there isn't a stated limit hardware will impose one when that list has to be stored.

I can remember running some Monte-Carlo calculations that were tracking photons making random tracks through the upper atmosphere. The loop count was high enough that 15 bit FORTRAN integers stored in the hardware registers were too small. Using a memory-stored integer at 24 bits created serious speed issues.

No. I wouldn't even think about using an interpreted script for that but I am curious about just what AppleScript's limit really is. Come to think of it, is there a limit on the length of an ordered list in AppleScript? Are such things stored in a stack? Are they linked so that each entry structure requires a memory pointer to the next? Or are the entries for a repeat loop really an array in consecutive memory addresses?

--

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