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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 know - IMO it's more about getting Espruino pre-installed on it. Usually it's a pain because it's extremely unlikely that the board will ship with Nordic's latest secure bootloader - so you're probably looking at uploading with an external SWD programmer.
Interesting that they're not using a module (so almost certainly not CE/FCC certified), but are still charging $20 for it :)