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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.
@AkosLukacs
Don't know, if you can still get leaded (lead metal) solder, but that has a lower melting point. (obviously not for production && wash your hands after).
Flux can help a lot. Even if you have rosin cored solder.