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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
In theory, yes. However in reality the Espruino firmware is too big to fit on an nRF51822 alongside the bootloader.
Honestly, if you're serious about getting something usable working, I'd look at getting a cheap nRF52832 based fitness tracker that has enough room for a full-featured Espruino - @fanoush had found some great ones in the $10-$15 range