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Simple question before I dug into it, does coroutines works on Kotlin/JS ?

Workers are heavyweight and have their own heap (kinda, there's some sharing)

The default dispatcher on JS uses `window.postMessage` in browsers with a window, and `process.nextTick` on NodeJS. Or it falls back to `setTimeout` if neither `window` nor `process` is available in the environment:
<https://github.com/Kotlin/kotlinx.coroutines/blob/master/kotlinx-coroutines-core/js/src/CoroutineContext.kt#L15>

Having coroutines doesn't mean having true parallelism. Coroutines are a framework for dealing with concurrency, just like promises and `setTimeout` do. You don't need actual multithreading to run coroutines, they can interleave on a single thread for instance.

Oh okay thanks I see, because I'm making a Minecraft-like game in 2D in the browser, but I want the world generation of blocks to be non-blocking as for now it freezes the entire window

Use yield() during the steps of the world generation process to allow other code to run

if you do need *real* parallelism (maybe it's too computationally heavy even with yielding) you will need to build on `Worker`, there isn't much support for it in Kotlin but it's just `postMessage`'ing between independent scripts. (<https://kotlinlang.org/api/latest/jvm/stdlib/org.w3c.workers/|https://kotlinlang.org/api/latest/jvm/stdlib/org.w3c.workers/> is wrappers for service workers which are quite a bit more complex than web workers)

I'll try using workers then, thanks for the information !

<https://kotlinlang.slack.com/archives/C0BJ0GTE2/p1650899355622169>