Sorry - I had my email address misconfigured so it rejected my email. Sending it again:
> Added my own repeatF() to the tests at http://jsperf.com/array-repeat/6. > Seems to be much faster than the others, at least on V8. > > > On Tue, Jan 3, 2012 at 2:28 PM, Herby Vojčík <he...@mailbox.sk> wrote: > > > Hello, >> >>> >> binary ftw. See >> http://jsperf.com/array-**repeat/4<http://jsperf.com/array-repeat/4>Array.prototype.repeatD. >> >> And I also tried push.apply in repeatC (not to copy over the array using >> concat but grow it in place until possible) and it really surprised me it >> was that much slower. Concat is probably heavily optimized. >> >>> >> Herby >> >>> >> -----Pôvodná správa----- From: Rick Waldron >> >> Sent: Tuesday, January 03, 2012 2:21 AM >> >> To: Adam Shannon >> >> Cc: es-discuss@mozilla.org ; Mariusz Nowak >> >> Subject: Re: Suggestion: Array.prototype.repeat >> >> >> >> >> >> On Mon, Jan 2, 2012 at 5:55 PM, Adam Shannon <a...@ashannon.us> wrote: >> Another thing to think about is that .repeat (both on String and >> Array) will be used a lot in production. So it would make sense for >> each solution to be optimized for their specific case. It doesn't make >> sense to slow down something as trivial as .repeat() >> >> >> Creating a 10000 item array by repeating a 1000 item array 10 times, the >> difference is negligible when compared the implementation that I wrote, not >> the one given above >> >> http://jsperf.com/array-**repeat/2 <http://jsperf.com/array-repeat/2> >> >> Also, note that I had to "make up" my own Array.repeat() because the >> Array.generate shown above did not create the same return as the initial >> Array.prototype.repeat(), but I stuck to the concepts laid out - no new >> array is initialized (except that Array.prototype.slice _does_ initialize a >> new Array() ). >> >> Rick >> >> >> ______________________________**_________________ >> es-discuss mailing list >> es-discuss@mozilla.org >> https://mail.mozilla.org/**listinfo/es-discuss<https://mail.mozilla.org/listinfo/es-discuss> >> >
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