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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.
@tanepiper
Option 2 would be nice here - it seems a bit of a waste of cycles to have to read an entire file just to get the latest entry. The solution I've come up with is to read the file into an array, unshift with the latest row then re-write the file. With this case, I can make each line a valid JSON separated by a line break and it works reasonably efficiently, and I can just get the first line for the latest data.