I tried searching it up on the internet but I don't find anything relevant.
Is there a way to call a function upon program termination in Javascript similar to the functionality of atexit() in C++?
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3Possible duplicate of [Run JavaScript code on window close or page refresh?](https://stackoverflow.com/questions/13443503/run-javascript-code-on-window-close-or-page-refresh) – apple apple Sep 11 '18 at 14:16
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https://developer.mozilla.org/en-US/docs/Web/API/WindowEventHandlers/onbeforeunload – Calvin Nunes Sep 11 '18 at 14:16
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because you tag browser. – apple apple Sep 11 '18 at 14:17