Which is faster...

[Bob Sneidar]

That is not exactly the test he was looking for. He wants to compare retrieving an array from a script local variable vs. getting a property of an object like a stack, that contains the same array. At least I think that is the question. 

Now I’d like to discuss virtual properties. It takes the form: 

Local lValueA

setProp myVirtualProperty, pValueA
   Put pValueA into lValueA
End setProp

The reason this is really handy is because if pValueA is an array, you can then use the form: 

getProp myVirtualProperty [pKey]
   If pKey is not empty then 
      Return lValueA [pKey]
   Else
      Return tValueA
End getProp

In other words, you can get elements of the array without getting the entire array itself i.e.:

Put the myVirtualProperty [“companyname”] of myLivecodeObject into tCompanyName

I use this quite extensively. I have a single card which contains all the currently queried database data for caching purposes, along with the currently selected indexes for each datagrid, and the currently selected primary keys. I call the getProp and setProp handlers maingriddata. So I can:

Get the maingriddata [“hilitedkeys”] of tMainCard
Get the maingriddata [“hilitedindexes”] of tMainCard
Get the maingriddata [“customers”]
Put the queriedCustomersA into tMainGridDataA
Set the maingriddata to tMainGridDataA

And so forth. Any kind of logic can be used in the getProp and setProp handlers. 

Bob S

> On Dec 14, 2023, at 2:25 PM, Craig Newman via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> Anything to distract me from my day job.
> 
> An array with 100,000 elements and a variable with 100,00 lines take the same time to place into a field.
> 
> The only time that took a while was building them. Each took 10 milliseconds.
> 
> Craig
> 
>> On Dec 14, 2023, at 4:55 PM, Paul Dupuis via use-livecode <use-livecode at lists.runrev.com> wrote:
>> 
>> Bob,
>> 
>> Thank you. I could script a timing test but sometime just asking the list or forums is easier. You asnwered well before I would have had the time to write a basic test script. Thanks!
>> 
>> 
>> On 12/14/2023 4:45 PM, Bob Sneidar via use-livecode wrote:
>>> I think the confusion comes from thinking so much of a stack as an object that has substance, when really all the properties are places in memory just like a memory variable is. I asked this some years back and the answer I got was that there is no appreciable difference.
>>> 
>>> One could always devise a test though…
>>> 
>>> Bob S
>>> 
>>> 
>>> On Dec 14, 2023, at 1:22 PM, Paul Dupuis via use-livecode <use-livecode at lists.runrev.com> wrote:
>>> 
>>> Which is faster or more efficient (from an engine performance perspective)?
>>> 
>>> To retrieve an array from a property?
>>> As in:
>>> command someHandler -- in an objects script
>>>  get the cMyArray from me -- cMyArray is some multi-dimensional array
>>>  ...
>>> end someHandler
>>> 
>>> OR
>>> 
>>> To retrieve an array from a script local variable?
>>> As in:
>>> local sMyArray -- script local variable in some objects script
>>> 
>>> command someHandler -- in an objects script
>>>  get sMyArray
>>>  ...
>>> end someHandler
>>> 
>>> Anyone know?
>>> 
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>> 
>> 
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