Rails spinoffs - Feb 2007 - Benchmark Question: Element.getElementsBySelector()

Hi !

I saw in documentation that getElementsBySelector() can work on
multiple selectors separated by coma. Is this method is Smart ?

 * getElementsBySelector(''A'',''P.cazz'',
''C[attrib]'');

Is faster that:

 * getElementsBySelector(''A'');
 * getElementsBySelector(''P.cazz'');
 * getElementsBySelector(''C[attrib]'');

For is it only a loop on given parameters with multiple parsing ?

Best Regards,
Jp
-- 
Jean-Philippe Encausse - R&D Jalios SA
Jp [at] encausse.net - http://www.encausse.com - http://www.jalias.com
GTalk: jp.encausse [at] gmail.com - SMS: sms [at] jp.encausse.net
Mob: +33 6 82 12 56 99 Jalios: +33 1 39 23 92 83 Tel: +33 1 39 18 90 15
Do it Once, Use it Twice ~ Do it Twice, Make It Once

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Spinoffs" group.
To post to this group, send email to
rubyonrails-spinoffs-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-spinoffs?hl=en
-~----------~----~----~----~------~----~------~--~---

Hey Jean-Philippe,

Casual perusal of the source code tells you that gEBS just forwards its 
argument list (minus the initial element) to Selector.findChildElements, 
available around line 1858, and this function essentially maps over the 
expressions.

So going with one call is going to be slightly faster, but on a very 
small scale: you just save the cost of a few extra function calls to 
gEBS, Selector.findChildElements, and map (with its lexical closure cost 
here).

In short, it''s not going to be noticably faster or slower one way or 
another.  On the other hand, it IS going to be more concise if you use 
only one call, as in your first example.

-- 
Christophe Porteneuve aka TDD
tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Spinoffs" group.
To post to this group, send email to
rubyonrails-spinoffs-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-spinoffs?hl=en
-~----------~----~----~----~------~----~------~--~---