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Re: Fastest Method to Append to a List

Subject: Re: Fastest Method to Append to a List
From: Mark Butcher <email@hidden>
Date: Mon, 21 Mar 2005 21:14:38 -0800
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On 2005, Mar 21, , at 7:59 PM, Martin Fuhrer wrote:

I want to create a list of items, eg. a list of numbers from 5000 to -5000. In Script Editor I can run the script:

<x-tad-smaller>set</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>myList</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>to</x-tad-smaller><x-tad-smaller> {}
</x-tad-smaller><x-tad-smaller>repeat</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>with</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>n</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>from</x-tad-smaller><x-tad-smaller> 1 </x-tad-smaller><x-tad-smaller>to</x-tad-smaller><x-tad-smaller> 10000
</x-tad-smaller><x-tad-smaller>set</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>end</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>of</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>myList</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>to</x-tad-smaller><x-tad-smaller> 5000 - </x-tad-smaller><x-tad-smaller>n </x-tad-smaller><x-tad-smaller>--</x-tad-smaller><x-tad-smaller>SLOW!!</x-tad-smaller><x-tad-smaller>
</x-tad-smaller><x-tad-smaller>end</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>repeat</x-tad-smaller><x-tad-smaller>
</x-tad-smaller>
Unfortunately, this is slow (about 30 seconds on my Powerbook G4 1.5 GHz). A much faster method is:

<x-tad-smaller>set</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>myList</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>to</x-tad-smaller><x-tad-smaller> {}
</x-tad-smaller><x-tad-smaller>set</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>myListRef</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>to</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>a reference</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>to</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>myList</x-tad-smaller><x-tad-smaller>

</x-tad-smaller><x-tad-smaller>repeat</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>with</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>n</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>from</x-tad-smaller><x-tad-smaller> 1 </x-tad-smaller><x-tad-smaller>to</x-tad-smaller><x-tad-smaller> 10000
</x-tad-smaller><x-tad-smaller>set</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>end</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>of</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>myListRef</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>to</x-tad-smaller><x-tad-smaller> 5000 - </x-tad-smaller><x-tad-smaller>n </x-tad-smaller><x-tad-smaller>--</x-tad-smaller><x-tad-smaller>FAST!!</x-tad-smaller><x-tad-smaller>
</x-tad-smaller><x-tad-smaller>end</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>repeat
</x-tad-smaller>
This takes less than a second when run in Script Editor.

Unfortunately, the second script will not work in an Applescript Studio project. The loop produces the "NSCannotCreateScriptCommandError (10)". The first script runs fine in Applescript Studio, but once again, takes about 30 seconds to complete.

If I recall correctly, 'my' worked for me:

<x-tad-smaller>repeat</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>with</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>n</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>from</x-tad-smaller><x-tad-smaller> 1 </x-tad-smaller><x-tad-smaller>to</x-tad-smaller><x-tad-smaller> 10000
</x-tad-smaller><x-tad-smaller>set</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>end</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>of my</x-tad-smaller><x-tad-smaller> myList</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>to</x-tad-smaller><x-tad-smaller> 5000 - </x-tad-smaller><x-tad-smaller>n </x-tad-smaller><x-tad-smaller>--</x-tad-smaller><x-tad-smaller>FAST!!</x-tad-smaller><x-tad-smaller>
</x-tad-smaller><x-tad-smaller>end</x-tad-smaller><x-tad-smaller> </x-tad-smaller><x-tad-smaller>repeat
</x-tad-smaller>
MarkB

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References:
	>Fastest Method to Append to a List (From: Martin Fuhrer <email@hidden>)

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