[dojo-contributors] Dojo 1.7 Goals: has() and granular dependency lists

Kris Zyp kzyp at dojotoolkit.org
Tue Mar 15 11:24:18 EDT 2011


Interesting. Should we do this?
if(has("array-foreach") && has("config-use-native-array")){
  /* native array methods */

(where config-use-native-array defaults to false)
Thanks,
Kris

On 3/15/2011 9:09 AM, Eugene Lazutkin wrote:
> If memory serves me correctly, this decision (use our implementation in
> all browsers) was done because of two factors: in almost all browsers
> native implementations were *slower* than trivial JavaScript once, and
> because of space considerations --- why ship two implemntations + a
> switch between them, if there are no other benefits?
>
> Just ran a test in Chrome 11 on Linux --- native versions 2-3 times
> slower on this benchmark: http://www.perfjs.com/#638003
>
> I tried it on FF3.6 --- forEach is twice slower, yet reduce* is almost
> the same.
>
> It appears that the current generation of browsers do not give us clear
> incentive to switch, other than for possible build reduction purposes.
>
> Cheers,
>
> Eugene Lazutkin
> http://lazutkin.com/
>
> On 03/15/2011 08:32 AM, Peter Higgins wrote:
> > All the array utilities do this in the webkit mobile build (use natives,
> > weird weird pragma at the bottom), but we were never serving native
> > iterators as our own even in browsers that support it.
>
> > On 3/15/11 9:13 AM, Kris Zyp wrote:
> >> On 3/14/2011 10:24 PM, Bill Keese wrote:
> >>> Doesn't your patch break backwards-compatibility?     Note the
> >>> comment in all the methods in the current code:
> >>>
> >>> //This method corresponds to the JavaScript 1.6 Array.indexOf method,
> >>> with one difference: when
> >>>
> >>> //run over sparse arrays, the Dojo function invokes the callback for
> >>> every index whereas JavaScript
> >>>
> >>> //1.6's indexOf skips the holes in the sparse array.
> >>>
> >>>
> >>
> >> I didn't write any new code, I just switched from the old build pragma
> >> to has() branching. If it is not backwards-compatible, it hasn't been
> >> backwards-compatible for sometime... So it is backwards-compatible
> >> with the old backwards-incompatibility ;).
> >>
> >> Kris
> >>
> >>
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>
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