Le 08/03/2012 18:02, Maël Nison a écrit :
Shouldn't native versions be more efficients ?
I heard V8 is on the path of self-hosting (writing standard functions in
JavaScript itself) as much as it can (can anyone confirm?).
It seems that in some cases, there is actually no benefit in writing in
C++ and a JavaScript-based solution can be 60% faster [1] [2]. This
example is DOM, but I wouldn't be surprised if it was true for some
ECMAScript functions.
Also, specifically, I would intuit that performance should not be that
different for mutation methods while it does change for methods that
create a new array since the engine can pre-allocate of correct size
right away (control that we don't have in JavaScript).
Regardless, performance had changed so quickly over tha last years that
I'm not sure any guess on performance is really accurate for long.
David
[1] https://twitter.com/#!/jdalton/status/165618550868946944
[2] https://twitter.com/#!/jdalton/status/165914543418126336
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