I do not remember how much of a performance boost we got from manipulating long
lists this way, but if memory serves, it was quite beneficial.
This code sample is just something I made up on the fly. Hopefully it
demonstrates the value of this method.
command createArray
local tListOfRecordIDs, tTableID
put fld "recordID data" into tListOfRecordIDs
put uuid() into tTableID
--FOUND IT FASTER TO WALK THROUGH LONG LISTS
--WHEN WE PUT THEM IN AN ARRAY LIKE THIS
--ONCE THE ARRAY IS MADE, IT WILL BE USED MANY TIMES OVER
--NEGATING THE COST OF MAKING THIS ARRAY
repeat for each line xRecordID in tListOfRecordIDs
put empty into tArrayA[tTableID][xRecordID]
end repeat
processArray tArrayA
end createArray
command processArray @rArrayA
put the keys of rArrayA into tTableID
--WALK THROUGH ARRAY LIST
repeat for each key xRecordID in rArrayA[tTableID]
--do something with xRecordID here
--we might modify something in this list
end repeat
--WALK THROUGH ARRAY LIST
repeat for each key xRecordID in rArrayA[tTableID]
--do something with this modified list from previous repeat
end repeat
end processArray
-Mark
> On Aug 19, 2016, at 12:22 PM, Mark Waddingham <m...@livecode.com> wrote:
>
> With the current implementation of the engine, the only reason using empty is
> faster than using pValue is because the latter requires a variable lookup,
> the former is a constant.
>
> What are you using sValueCache for?
>
> Sent from my iPhone
>
>> On 19 Aug 2016, at 19:37, Mark Talluto <m...@canelasoftware.com> wrote:
>>
>>
>>> On Aug 19, 2016, at 10:42 AM, Mark Waddingham <m...@livecode.com> wrote:
>>>
>>> command shareAndStoreKey @xArray, pKey, pValue
>>> set the caseSensitive to true -- this is assuming your values are
>>> sensitive to case
>>> if pValue is not among the keys of sValueCache then
>>> put pValue into sValueCache[pValue]
>>> end if
>>> put sValueCache[pValue] into xArray[pKey]
>>> end command
>>
>>
>> Hi Mark,
>>
>> We have been doing:
>> put empty into sValueCache[pValue] --as an optimization.
>>
>> How does this compare to:
>> put pValue into sValueCache[pValue] --in terms of performance?
>>
>>
>> Best regards,
>>
>> Mark Talluto
>> livecloud.io
>> canelasoftware.com
>>
>>
>>
>>
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