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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
Strange - sorry about that, I'm not sure how the tutorial was left unfinished. I'll make sure I update it tomorrow.
Yes, it's almost certainly the capacitor. You want it across the power wires to the LEDs, so if you're using breadboard as in the tutorial, just stick it in the two power rails, making sure plus and minus are in the right way around.