Re: Google Dart Released Today

From	Duncan Booth <duncan.booth@invalid.invalid>
Newsgroups	comp.lang.javascript
Subject	Re: Google Dart Released Today
Date	2011-10-13 08:21 +0000
Message-ID	<Xns9F7D5F12F3F07duncanbooth@127.0.0.1> (permalink)
References	<cb47d781-dc6b-4e5b-9ccb-6e1d18edcf3b@l30g2000pro.googlegroups.com> <1094da0d-f929-49ec-9875-1096cb4ff481@db5g2000vbb.googlegroups.com> <6ff9c23e-a7d9-42fe-9e86-8799eddcfd93@6g2000prh.googlegroups.com> <c1b545ef-4fa2-4e47-b555-396facc6b6c2@j20g2000vby.googlegroups.com>

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Scott Sauyet <scott.sauyet@gmail.com> wrote:

> dhtml wrote:
>> Michael Haufe wrote:
>>> dhtml wrote:
>>
>>>> Dart is a new language by Google with new syntax and new operators.
>>>> A language overview
>>>> here:http://www.dartlang.org/articles/idiomatic-dart/ 
>>>> Goals:http://www.dartlang.org/docs/technical-
overview/index.html#goa
>>>> ls 
>> [ ... ]
>>> I think the generated code is a minor issue in comparison.
>>
>> Take a look at this code and then tell me if you have a different
>> opinion:https://gist.github.com/1277224
> 
> FWIW, I posted the results from a code-coverage tool [1] at
> 
>     http://scott.sauyet.com/Javascript/Test/2011-10-12a/?
HelloDartTest.
>     html 
> 
> According to JSCoverage, 31% of the generated code is executed when
> the script is run.
> 
> I can't figure out whether to cry because that is so low, or because
> it is so high.

You should do neither. That output example posted on github was the 
hello world program compiled with all optimisations disabled. As such it 
is not suprising that it includes the complete Dart runtime library.

Debug compilation adds in a lot of type checking code that isn't present 
at all in a production build and it also keeps all of the unused classes 
and methods around.

> 
> Digging into the details, though, a lot of what is run is the function
> declarations and named function expressions, rather than the actual
> bodies of these functions.  You can see this choosing the Summary Tab
> and the "HelloDartTest.dart.app.js" link in that tab.
> 
Yes, so if you allow the optimiser to run you lose those function 
declarations for the cases where Closure can tell for certain the code 
is never used. You still keep a fair bit of the runtime support so 
there's no way you could call the output lean but the optimised 
Javascript is only 5% as long as the one posted on github and 39 lines 
instead of 17297. A possibly fairer comparison is to compile with 
optimisation turned on and the '--human-readable-output' option which 
results in 2188 lines that are arguably just about readable.

Perhaps those numbers will improve further before dart is actually 
released, but if browsers ever include native support they become 
irrelevant anyway. I think a lot of the code left after optimisation is 
the isolate worker code since even as simple an example as hello world 
runs in a Dart isolate.

-- 
Duncan Booth http://kupuguy.blogspot.com

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Thread

Google Dart Released Today dhtml <dhtmlkitchen@gmail.com> - 2011-10-10 10:44 -0700
  Re: Google Dart Released Today "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2011-10-10 14:24 -0700
    Re: Google Dart Released Today dhtml <dhtmlkitchen@gmail.com> - 2011-10-10 22:36 -0700
      Re: Google Dart Released Today David Mark <dmark.cinsoft@gmail.com> - 2011-10-10 23:41 -0700
      Re: Google Dart Released Today "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2011-10-11 05:33 -0700
        Re: Google Dart Released Today dhtml <dhtmlkitchen@gmail.com> - 2011-10-11 14:06 -0700
          Re: Google Dart Released Today Swifty <steve.j.swift@gmail.com> - 2011-10-12 07:13 +0100
      closure bindings (was: Google Dart Released Today) Andreas Bergmaier <andber93@web.de> - 2011-10-11 23:56 +0200
        Re: closure bindings (was: Google Dart Released Today) David Mark <dmark.cinsoft@gmail.com> - 2011-10-11 16:20 -0700
        Re: closure bindings Bwig Zomberi <zomberiMAPSONNOSPAM@gmail.invalid> - 2011-10-12 15:02 +0530
          Re: closure bindings Antony Scriven <adscriven@gmail.com> - 2011-10-12 05:12 -0700
            Re: closure bindings dhtml <dhtmlkitchen@gmail.com> - 2011-10-12 18:27 -0700
        Re: closure bindings Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-10-12 13:24 +0200
          Re: closure bindings "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2011-10-12 08:56 -0700
            Re: closure bindings Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-10-12 21:15 +0200
              Re: closure bindings "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2011-10-12 15:21 -0700
                Re: closure bindings Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-10-13 20:56 +0200
                Re: closure bindings Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-10-13 21:36 +0200
                Re: closure bindings "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2011-10-13 16:41 -0700
                Re: closure bindings dhtml <dhtmlkitchen@gmail.com> - 2011-10-13 22:39 -0700
                Re: closure bindings "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2011-10-14 09:03 -0700
                Re: closure bindings Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-10-14 20:05 +0200
              Re: closure bindings dhtml <dhtmlkitchen@gmail.com> - 2011-10-12 18:38 -0700
                Re: closure bindings Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-10-14 23:34 +0200
                Re: closure bindings dhtml <dhtmlkitchen@gmail.com> - 2011-10-14 16:56 -0700
                Re: closure bindings Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-10-15 02:44 +0200
                Re: closure bindings dhtml <dhtmlkitchen@gmail.com> - 2011-10-14 21:18 -0700
            Re: closure bindings David Mark <dmark.cinsoft@gmail.com> - 2011-10-12 18:28 -0700
      Re: Google Dart Released Today Antony Scriven <adscriven@gmail.com> - 2011-10-11 15:13 -0700
        Re: Google Dart Released Today dhtml <dhtmlkitchen@gmail.com> - 2011-10-11 22:33 -0700
      Re: Google Dart Released Today Scott Sauyet <scott.sauyet@gmail.com> - 2011-10-12 07:27 -0700
        Re: Google Dart Released Today dhtml <dhtmlkitchen@gmail.com> - 2011-10-12 18:29 -0700
        Re: Google Dart Released Today Duncan Booth <duncan.booth@invalid.invalid> - 2011-10-13 08:21 +0000
          Re: Google Dart Released Today Scott Sauyet <scott.sauyet@gmail.com> - 2011-10-13 04:46 -0700
            Re: Google Dart Released Today unbewusst.sein@fai.invalid (Une Bévue) - 2011-10-13 14:03 +0200
              Re: Google Dart Released Today Duncan Booth <duncan.booth@invalid.invalid> - 2011-10-13 12:40 +0000
                Re: Google Dart Released Today unbewusst.sein@fai.invalid (Une Bévue) - 2011-10-13 17:51 +0200
            Re: Google Dart Released Today Duncan Booth <duncan.booth@invalid.invalid> - 2011-10-13 13:31 +0000
              Re: Google Dart Released Today Duncan Booth <duncan.booth@invalid.invalid> - 2011-10-13 15:17 +0000
            Re: Google Dart Released Today Karl Tikjøb Krukow <karl.krukow@gmail.com> - 2011-10-14 13:02 +0200
              Re: Google Dart Released Today dhtml <dhtmlkitchen@gmail.com> - 2011-10-14 12:36 -0700
                Re: Google Dart Released Today Karl Tikjøb Krukow <karl.krukow@gmail.com> - 2011-10-15 19:30 +0200
  Re: Google Dart Released Today David Mark <dmark.cinsoft@gmail.com> - 2011-10-10 22:23 -0700
  Re: Google Dart Released Today Matt McDonald <matt@fortybelow.ca> - 2011-10-12 19:48 -0600
    Re: Google Dart Released Today dhtml <dhtmlkitchen@gmail.com> - 2011-10-12 21:04 -0700

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