Re: why lua?

[Philipp Gesang <pgesang@ix.urz.uni-heidelberg.de>]

[-- Attachment #1.1: Type: text/plain, Size: 1252 bytes --]

On 2010-12-18 <14:20:46>, Hans Hagen wrote:
> On 18-12-2010 2:06, Philipp Gesang wrote:
> 
> >What always baffled me is that in the manual Roberto advertises
> >ipairs() as the iterator of choice (at least in the v.5.0 doc).
> >Compared to the other options using it is just, well, erratic.
> 
> I did lots of testing (an doptimizing) in critical code but in
> practice one will not notice much difference in a mkiv run.
> Actually, I changed all pairs, ipairs as there was a temporary
> intention to remove them from the lua core.
> 
> btw, in for i=1,#t do ... the #t is also a function call (so having

My fault, I just forgot about that; with the array size stored in
a local variable the “for” loop is faster than “while”, as
expected.

> many in these t[#t+1] = ... cases is also slower but again, seldom
> noticeable as lua in general is so fast

… when adding to an array the “t[#t+1] = elm” approach turns out
to be still faster than table.insert() which, again, is
advertised in the manual. Even python’s append() method is faster
than table.insert() and that means a lot.

Philipp

-- 
()  ascii ribbon campaign - against html e-mail
/\  www.asciiribbon.org   - against proprietary attachments

[-- Attachment #1.2: Type: application/pgp-signature, Size: 198 bytes --]

[-- Attachment #2: Type: text/plain, Size: 486 bytes --]

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________