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jQuery is huge compared to doing it by hand, and I actually chose against jQuery for a web service targeted at mobile phones.

However, in the case of jQuery the productivity / KB ratio is freakishly huge.

I fail to see how that will be the case for a new programming language. Javascript is already fast and still improving in bounds and leaps. It is also finally possible to write correct cross-browser code with the help of jQuery and CoffeeScript. It is a true standard.

What can Dart really provide that Javascript cannot?

Refactoring tools? Some people would like that, but it still won't be bullet proof (as I understand the static types in Dart are optional), and there's nothing worse that a tool on which you can't rely on (personally I hate the Intellisense attempts being made in IDEs for Ruby or Python).

What about speed? Well, Java/Quake2 was compiled to Javascript using GWT and it worked just fine -- what more could you want from a sandboxed environment? To me, these days big page load times either on my desktop or on my mobile are almost always related to bandwidth.




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