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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'm not sure it will. However, you could use pretty much any shift register if your LEDs are all common-grounded. They're cheap, easy to wire, and very easy to interface to.
Adafruit have a tutorial for Arduino here: https://learn.adafruit.com/adafruit-arduino-lesson-4-eight-leds/overview
Same thing with Espruino really - but you can just chain most shift registers together, so you can add as many blocks on LEDs as you want.