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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
On my Mac I had to use a dongle too - do you have a link to the instructions you used?
If you have the developer tools you can use something called 'Bluetooth Explorer', or according to this it may automatically switch over on reboot: http://apple.stackexchange.com/questions/94402/force-os-x-to-use-bluetooth-dongle-instead-of-built-in-controller