> Apparently this can give a 20% code reduction. I am curious why such a big
> decrease.
It varies.
> GWT and the closure compiler seem to do very similar optimizations
No. I would say both compilers are very different.
GWT does a fantastic job at the Java level. It leverages the Java type
system very well to perform a lot of optimization that Closure Compiler
developers can only dream of due to the dynamic nature of Javascript. The
GWT team spends a lot of time making sure the compiler generate optimized
code that mimics Java behaviors. That has also been the biggest win.
On the other hand Closure Compiler team focuses on raw Javascript size. The
developers spends countless hours looking at compressed Javascript and ways
to squeeze a few kilobytes here and there until it adds up.
-Alan
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