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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
Just to clarify this:
Espruino isn't 100% of any JavaScript spec (for instance no Regular Expressions at the moment), but it's pretty much ES5, with some ES6 features (arrow functions, template strings, binary literals, forEach/etc on ArrayBuffers) where it makes sense.
Functionality gets added all the time though - see http://www.espruino.com/Features for an up to date list