I am a casual user of JS and was always wondering how to write true asynchronous routines in JS. The kind you fire and forget and they end when they end. An ex

I am a casual user of JS and was always wondering how to write true asynchronous routines in JS. The kind you fire and forget and they end when they end. An example would be fetch, but all the docs/tutorials I saw are needed on async await where you have to explicitly yield in your code (as opposed, say, to threading in python or goroutines)