[Development] QtScript vs Qml/QJsEngine ?

Thiago Macieira thiago.macieira at intel.com
Wed May 30 16:57:07 CEST 2012

On quarta-feira, 30 de maio de 2012 15.11.18, Olivier Goffart wrote:
> QtScript was originally developed using its own JavaScript engine. 

Add here, because Olivier's description skipped one or two years in history 
between the sentences.

When it was originally developed, the QtScript engine was state-of-the-art and 
was faster than almost any JavaScript implementation that we could get our 
hands on, specifically Mozilla's SpiderMonkey and KDE / WebKit's KJS (they 
hadn't diverged much yet). IIRC, the only areas where Roberto didn't manage to 
get better performance was where Qt compatibility was required, for example in 
the use of QString.

> While good, it was year behind the state of the art JS engine. It was much 
> much slower (did not have JIT)  and the new ECMAScript feature were not 
> implemented yet.  (the old engine is still available in the QtScript
> Classic  solution [1])
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
     Intel Sweden AB - Registration Number: 556189-6027
     Knarrarnäsgatan 15, 164 40 Kista, Stockholm, Sweden
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