Has anyone been able to figure out if YUIMin still behaves as you would
expect it to?
--John
On Wed, May 20, 2009 at 6:48 AM, Andrea Giammarchi <
andrea.giammar...@gmail.com> wrote:
> Ok, the reason eval is so slow is because of FireBug, it costed 17 seconds
> with FireBug enabled while FireBug seems to do not affect Function execution
> (which makes Function against better than eval).
>
> In any case, Function is faster or exactly fast as eval is, even in
> Internet Explorer, at least in my tests.
>
> this is a truly simple readapted test case:
>
> <!DOCTYPE html>
> <script type="text/javascript">
> portable = (function(msg, i, interval){
> function timeout(){
> alert(msg.join("\n"));
> msg = [];
> i = 0;
> };
> return {
> log:function(test){
> msg[i++] = test;
> clearTimeout(interval);
> interval = setTimeout(timeout, 100);
> }
> }
> })([], 0, 0);
> var count = 10000, o = null, i = 0, jsonString =
> '{"value":{"items":[{"x":1,"y":2,"z":3},{"x":1,"y":2,"z":3},{"x":1,"y":2,"z":3},{"x":1,"y":2,"z":3},{"x":1,"y":2,"z":3}]},"error":null}';
> var beginTime = new Date();
> for ( i = 0; i < count; i++ )
> o = eval( "(" + jsonString + ")" );
> portable.log( "eval:" + ( new Date() - beginTime ) );
> var beginTime = new Date();
> for ( i = 0; i < count; i++ )
> o = new Function( "return " + jsonString )();
> portable.log( "new Function:" + ( new Date() - beginTime ) );
> var beginTime = new Date();
> for ( i = 0; i < count; i++ )
> o = Function( "return " + jsonString )();
> portable.log( "Function:" + ( new Date() - beginTime ) );
> var beginTime = new Date();
> var callback = Function( "return " + jsonString );
> for ( i = 0; i < count; i++ )
> o = callback();
> portable.log( "precompiled Function:" + ( new Date() - beginTime ) );
> if(this.JSON){
> var beginTime = new Date();
> for ( i = 0; i < count; i++ )
> o = JSON.parse(jsonString);
> portable.log( "native:" + ( new Date() - beginTime ) );
> };
> </script>
>
> Let me know what you think.
>
> Regards
>
>
>
>
>
> On Wed, May 20, 2009 at 7:43 AM, Andrea Giammarchi <
> andrea.giammar...@gmail.com> wrote:
>
>> As I said, Function does not do scope resolution except the global one so
>> in my opinion should be always preferred for JSON evaluations. Firefox does
>> not care about implicit returned value plus brackets plus scope, it simply
>> create the anonimous function doing a syntax check and returns errors only
>> at call time so if there are no errors the precompiled funcion will be like
>> a manual one, time for parsing syntax is then one against every eval call.
>> To be fair, that bench make sense declaring the function once and simply
>> calling it inside the for to always return the same object. Unfortunately
>> this is not a real world case.
>>
>> On May 20, 2009 7:33 AM, "Michael Geary" <m...@mg.to> wrote:
>>
>> Function( 'return ' + data )() is also MUCH faster in Firefox than eval.
>>
>> In a test case of JSON data containing 1000 names and addresses (about
>> 112KB), eval() takes a full second to execute on my machine in Firefox 3. On
>> all other browsers (including IE!) it takes hardly any time at all.
>>
>> The Function version takes essentially no time in Firefox. (Didn't test it
>> in other browsers.)
>>
>> -Mike
>>
>> ------------------------------
>> *From:* jquery-dev@googlegroups.com [mailto:jquery-...@googlegroups.com]
>> *On Behalf Of *John Resig
>> *Sent:* Tuesday, May 19, 2009 4:20 PM
>> *To:* jquery-dev@googlegroups.com
>> *Subject:* [jquery-dev] Re: window['eval']() in rhino
>>
>> > I don't remember the original discussion/change, off-hand. If YUIMin is
>> still able to generate an ...
>>
>>
>
> >
>
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