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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
I've just tested this, and yes - it does remove comments as well :)
And yes, comments do slow execution down - but only when inside a function - so if you put comments before the start of a function it won't make any difference at all.