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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.
@halemmerich
Compared to complete rewrites for every corrected line it will save on both. Compared to having a "delete previous line"-marker probably not, depending on data line length.
Having a variable for the last line is surely best if changing apps does not happen that often while logging.