Repeat for each line of a variable or field?

Bob Sneidar bobsneidar at iotecdigital.com
Mon Jan 14 16:58:26 CET 2019


Also if you do not lock the screen the engine has to update the display each time a line changes. Not sure if this is the case if the line is not visible...

Bob S


> On Jan 12, 2019, at 08:37 , JB via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> It is faster to use version 1 because accessing the
> lines in a variable is faster than accessing lines in
> a field.
> 
> JB
> 
> 
>> On Jan 12, 2019, at 8:01 AM, David Epstein via use-livecode <use-livecode at lists.runrev.com> wrote:
>> 
>> I've done a little bit of speed testing showing extremely slight differences, but wonder if anyone who understands the "engine" can advise on this:
>> 
>> Is there a difference between these two approaches?
>> 
>> (1) put fld 1 into txt; repeat for each line k in txt; etc.
>> 
>> and
>> (2) repeat for each line k in fld 1; etc.
>> 
>> For no very good reason, I tend to do (1), but have begun to wonder:  for a very lengthy field 1, does my writing to a variable use up more RAM, and so perhaps injure performance?  Or is the engine in effect writing to a variable either way?  Is a variable read more quickly than a field?  
>> 
>> Many thanks.
>> David Epstein
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