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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
I think it must be a reasonably new addition to the language - why it wasn't in Espruino before.
And Acorn/Tern/JSLint in the IDE are old enough that they don't support it either - so I guess they need updating at some point as well.