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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 should add about trying Espruino out, you can do it using the online Bangle.js emulator and it could be a fun way to play: https://www.espruino.com/ide/emulator.html
I do have a book, called 'Making Things Smart'
It covers making a few simple hardware projects with JavaScript - it doesn't cover JS in great detail, or the hardware in great detail, but it could be a fun way to get to grips with the hardware.
I have also heard a lot about 'JavaScript: The Good Parts', but I haven't read it.
However honestly, there should be a bunch of material online without needing a book (including tutorials on espruino.com) but I'm afraid I don't have any specific links