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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
Can you see the Ruuvitag in the Mac's own Bluetooth menu? I think with 2011 it's a possibility it won't have it. My 2009 iMac didn't.
The info you need to check (and commands to swap bluetooth over) are here: http://www.espruino.com/Puck.js+Quick+Start#mac-os