Re: Shorthand for appending to a table (was Re: 5.2 feature list?)

[gary ng <garyng2000@...>]

--- Sam Roberts <sroberts@bycast.com> wrote:
> > less than 25% difference... not significant
> 
> Not if you do it once. If you have identified the
> time spent appending
> to tables as being significant in your app, cutting
> that time by 20%
> would be a major coup!
> 
> Also, it could be more, since the #t+1 takes time,
> but if [] didn't take
> an arg, finding that would be a C pointer
> dereference internally, maybe
> this gives a feel for that, maybe not:
> 
> lua5.1 -e 'local t={1,2,3,4,5} for i = 1,1e8 do
> t[#t+0]=1 end'  13.33s user 0.00s system 96% cpu
> 13.851 total
> lua5.1 -e 'local t={1,2,3,4,5} for i = 1,1e8 do
> t[5]=1 end'      9.82s user 0.02s system 91% cpu
> 10.769 total
> 
Does it worth it to be part of the language just for
the 25% gain ? I would buy it if we are talking about
5x and it really is used a lot.
> 
> 


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