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Conversely, because each await expression operates on a promise but sits inside a function, the operation of the function itself can proceed by waiting on each promise in turn. Code structures like loops can contain await expressions inside them, allowing the loop to suspend and resume later on. This
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I went ahead and added a rough draft explaining the async/await feature. I haven't cited any sources yet (though most of the information can be sourced by C#'s official documentation on the subject as well as Eric
Lippert's .NET blogs) and haven't honed down appropriate pages for the dead links, but
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Because an async-annotated function always returns its result via a promise, it is permitted to use an await expression within it. The first time the function is required to suspend because of an await expression on an unresolved promise, it can return an unresolved promise of its own to its caller
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keyword operates on an expression that provides a promise and pauses execution of the containing function if the result of that promise is not yet available. The function remains suspended until the promise is fulfilled, at which point the function will resume execution. The await expression itself
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I added a "Benefits and
Criticisms" section in order to provide room for quotes from well-renowned CS experts on the async/await pattern. Currently, the article reads with just a factual description of the subject that leans a little too much on its promised benefits, but I do remember reading
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method it is possible to chain a sequence of operations together one after another, more difficulty comes in trying to express patterns like repeating loops, iteration over a list, or perform nested conditional operations. Because the body of each
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The article doesn't describe the flow of control executed by an await command. It only describes what it doesn't do, then goes right into implementation details. I've read the article twice and still have no idea what "await" does.
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keyword annotates the definition of a function and has two effects. It permits the body of the function to use an await expression, and it alters the return type or value of the function, so that it is wrapped in a promise.
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criticisms of this pattern when it was newer, such as a complaint that it overtakes your program like a "zombie virus". I don't have time to research this myself, so could someone else add a few of these?
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leads to a much more natural way to write promise-driven code, because the programmer can use the familiar language features of control flow even when dealing with promise-based asynchronous behaviour.
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The async/await pattern is usually expressed in the form of two additional keywords, named async and await, which interact with values of a type used to represent a deferred operation, often called a
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More and more languages have adopted coroutine, so do compiler implementations. In section 8, "In C++", I believe the statement "GCC still has no support for it" need update. See
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invocation has to be a self-contained function in its own right, syntactical structures like loops or conditionals cannot span multiple promise-based operations.
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I wonder if the page would be improved by the following explanation of the syntax from a fairly language-neutral perspective.
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it's a start. Would you say it helps clarify the issue more clearly than the previous version of the article?
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The async/await syntax can be seen as a development from earlier techniques, such as the
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