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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
Great, thanks for letting me know! I've just updated the code/documentation.
It's because Espruino used to remember the value of 'this' when setInterval was called (which I believe was wrong). I fixed that and forgot to change the docs :)