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 many
in these t[#t+1] = ... cases is also slower but again, seldom noticeable
as lua in general is so fast
a similar dicussion can be held for strings being hashed but again the
penalty is neglectable esp if one takes into account that strings only
have one instance and compare real fast (pointer comparison); in mkiv /
luatex we have lots of strings (keys, identical values, etc) and it
really pays off to have them hashed
Hans
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