Re: Autoboxing
I suppose: In JS there is no distinction between *Integer* and *int*. In JS there's only a single *var* type*.* -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/Vh89_PPMV0YJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Autoboxing
That's actually wrong. typeof 1 number typeof new Number(1) object 1 instanceof Number false new Number(1) instanceof Number true But it's true however that GWT does not make any distinction between a Number value and a Number object, because in practice it doesn't matter much (it only matters if you use the typeof or instanceof operators, or when some browsers are buggy –such as Firefox throwing for foo[new String(bar)] whereas foo[bar] is OK–) -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/nvaYXd2yLuYJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Autoboxing
Generally speaking, it's a waste of time to worry about performance implications of such small things until you've proven that it's a performance issue for your app. Choose the right type for the job, and forget about autoboxing implications until it comes knocking at the door. “premature optimization is the root of all evil” — Donald Knuth See http://en.wikipedia.org/wiki/Program_optimization#When_to_optimize FYI, Integer.valueOfhttp://code.google.com/p/google-web-toolkit/source/browse/trunk/user/super/com/google/gwt/emul/java/lang/Integer.java#231is not trivial, but I believe there are many other places in your app (and unfortunately within GWT itself) that needs to be optimized before thinking about autoboxing; starting with DOM manipulation, which is awfully slow in many browsers (much slower than creating a new JS object that wraps a number). -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/lXuJHXlraW8J. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Autoboxing
It's actually not buggy. JavaScript distinguishes between objects and
values, and objects are containers for
valueshttps://developer.mozilla.org/en/JavaScript/Guide/Values%2c_Variables%2c_and_Literals.
So when JSON { a = b, c = 2 } is evaluated, it actually assigns values to
the properties (at least in Mozilla), not objects. Values are more efficient
that objects.
bar.length is automatically
convertedhttps://developer.mozilla.org/en/JavaScript/Guide/Values%2c_Variables%2c_and_Literals#String_Literalsto
new String(bar).length, and the String object is discarded after the
length property is used.
--
You received this message because you are subscribed to the Google Groups
Google Web Toolkit group.
To view this discussion on the web visit
https://groups.google.com/d/msg/google-web-toolkit/-/0gAdZUy8mqMJ.
To post to this group, send email to google-web-toolkit@googlegroups.com.
To unsubscribe from this group, send email to
google-web-toolkit+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Autoboxing
The most cited phrase is attributed to the man who invented his own assembly language to optimize every algorithm in his books and who spent 30 years on optimizing the the first 3 volumes :-) He has so much yet to say to this world but because of the time he spends on optimization, I doubt we'll be able to see everything of what is plannedhttp://www-cs-staff.stanford.edu/~uno/taocp.html:-( -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/9od3OTHcqXAJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Autoboxing
Yes it is: https://bugzilla.mozilla.org/show_bug.cgi?id=514309 (yes, the bug actually was with hasOwnProperty rather than getting/setting properties of objects, and has been fixed back in Firefox 3.6, but still, it led to workarounds in GWT: http://code.google.com/p/google-web-toolkit/source/detail?r=7060 http://code.google.com/p/google-web-toolkit/source/detail?r=7063 ) Please note that I was explicitly pointing out that JS distinguishes between values and objects, so the difference in typeof and instanceof is indeed not a bug (but oh so many JS libs are buggy –or should explicitly document their behavior– because their developers don't account for both String values and String objects; including GWT in a few edge cases: http://code.google.com/p/google-web-toolkit/issues/detail?id=4301 ) -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/yg2nOHTlL0AJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Autoboxing
Please excuse my ignorance, I'm surprised to see the emulator code is Java. I'd have thought it would be in JavaScript. Is the point that the emulator is Java that the translator can handle? I wonder what Integer.valueOf looks like in JavaScript? Perhaps by explicitly writing Integer.valueOf I am forcing the creation of additional JavaScript that would otherwise be omitted as unnecessary?! (I'm well aware of the premature optimisation adage. If by arming yourself with a little knowledge you can avoid writing code that you know might harm performance without sacrificing readability or implementation time, that has to be a good thing.) On Sep 12, 10:56 pm, Thomas Broyer t.bro...@gmail.com wrote: Generally speaking, it's a waste of time to worry about performance implications of such small things until you've proven that it's a performance issue for your app. Choose the right type for the job, and forget about autoboxing implications until it comes knocking at the door. “premature optimization is the root of all evil” — Donald Knuth Seehttp://en.wikipedia.org/wiki/Program_optimization#When_to_optimize FYI, Integer.valueOfhttp://code.google.com/p/google-web-toolkit/source/browse/trunk/user/...is not trivial, but I believe there are many other places in your app (and unfortunately within GWT itself) that needs to be optimized before thinking about autoboxing; starting with DOM manipulation, which is awfully slow in many browsers (much slower than creating a new JS object that wraps a number). -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Autoboxing
-style PRETTY GWT compiler optionhttp://code.google.com/webtoolkit/doc/latest/DevGuideCompilingAndDebugging.html#DevGuideCompilerOptionsis a good tool to understand what kind of output is generated. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/L-tJZgqi3eQJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
