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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
Actually, since using that I found the nRF52 devkit is a more sensible price: http://www.mouser.co.uk/ProductDetail/Nordic-Semiconductor/NRF52-DK/?qs=79dOc3%2f91%2fccrafuGv4fOw%3d%3d
If you get the nRF52 DK then you get the new nRF52 chip in it as well, and can play around with the code that'll run on Puck.js too.
The flashing is way easier too. You just wire the board up to a 0.1" header, and then it appears as a USB flash drive and you just copy the hex file over to that drive.
It's slightly more expensive than the discovery board but it's totally worth it :)