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> This unnecessarily trivializes the technical problems at hand. Making a language that automatically generates two versions of a function, one that is async a

> This unnecessarily trivializes the technical problems at hand. Making a language that automatically generates two versions of a function, one that is async and returns a Promise-wrapped object, and another that is sync, is not hard. > This is exactly what JavaScript did. No, it isn't. JavaScript requires you to declare functions as async at the function definition, and you can't call async functions from sync ones. This is exactly the thing I am arguing against, and is the opposite of "The right place is the call site."

spankalee 2y ago
If it wasn't hard, it would have been done. I suppose we should all await your backwards compatible proposal? > No, it isn't. Yes, actually, it is. Async functions are a concept that only affects the internal structure of a function - to generate the state machine that allows yielding at `await` keywords and resuming after they resolve. Externally they are no different from "sync" Promise-returning functions. So they only thing that async functions do is enable yielding at the callsite, the `await` keyword is what actually yields at the callsite and you can await anything, not just async functions. Again: > I want to be able to designate a computationally-intense function call (just that call, leaving the other calls alone) as async so that control yields to the event loop. This is what `await` is - `await` yields. Non-await calls don't yield.
- throw10920 2y ago
  > If it wasn't hard, it would have been done. This comment shows a true departure from reality. Computing is filled to the brim with ideas that are easy but are not implemented for reasons other than difficulty. > I suppose we should all await your backwards compatible proposal? Your sarcasm merely helps to further demonstrate that you're not interested in a serious discussion. > Yes, actually, it is. Then it should be trivial for you to show me an instance of a sync function calling an async one, synchronously waiting for it, then getting back the return value, without clever hacks.
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spankalee 2y ago

If it wasn't hard, it would have been done. I suppose we should all await your backwards compatible proposal? > No, it isn't. Yes, actually, it is. Async functions are a concept that only affects the internal structure of a function - to generate the state machine that allows yielding at `await` keywords and resuming after they resolve. Externally they are no different from "sync" Promise-returning functions. So they only thing that async functions do is enable yielding at the callsite, the `await` keyword is what actually yields at the callsite and you can await anything, not just async functions. Again: > I want to be able to designate a computationally-intense function call (just that call, leaving the other calls alone) as async so that control yields to the event loop. This is what `await` is - `await` yields. Non-await calls don't yield.

throw10920 2y ago
> If it wasn't hard, it would have been done. This comment shows a true departure from reality. Computing is filled to the brim with ideas that are easy but are not implemented for reasons other than difficulty. > I suppose we should all await your backwards compatible proposal? Your sarcasm merely helps to further demonstrate that you're not interested in a serious discussion. > Yes, actually, it is. Then it should be trivial for you to show me an instance of a sync function calling an async one, synchronously waiting for it, then getting back the return value, without clever hacks.

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