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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 add that another option is just to change the foreground colour to the background colour and to then write exactly the same text at 30,30 :) It's not as fast as a rectangle clear, but potentially it might make your code tidier