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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.
@halemmerich
To give some indications for speed/RAM:
Allocation of one full screen 4 bit buffer on Bangle.js 2 would be about 10% of the RAM. On Bangle.js 1 probably more like about a quarter.
1000 iterations of an empty for loop take nearly 230ms
Assigning a variable on each iteration costs 136ms extra
Commenting out that assignment still costs 24ms over the base loop
As for javascript as the language of choice I'm with @fanoush. You could use C/C++ like on other micros, but that will cost a lot of convenience and simplicity. Nevertheless you can even include native/compiled code in the JS if you need every last bit of speed the processor can muster.