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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.
@fanoush
Instead of substrings the best workaround is probably to combine
Storage.readwith offset,length parameters and wrap the result byE.toArrayBufferAs for Inline C it may not work as you expect with storage in SPI flash (Bangle watches), the 200K string is not directly in memory but read over SPI by JS interpreter on demand when iterating over it.
It might work with Storage in internal flash but there is not much space for big files there.