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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
It's best just to look at what we know it runs on. As far as I know the F479 discovery runs, but I'm not sure USB is working reliably.
You're pretty safe with the F401/F411/2/3 I believe as those are the types that I actually use for Espruino.
However if you want something with the real power you could look at http://www.espruino.com/STM32L496GDISCOVÂERY - ST did the porting work for that so I'd hope it would be reasonably ok to do your own.