This is better in that there is far less boilerplate, but it doesn't solve everything. Async iteration was retrofitted onto an API that wasn't designed for it, and it shows. Features like BYOB (bring your own buffer) reads aren't accessible through iteration. The underlying complexity of readers, locks, and controllers are still there, just hidden. When something does go wrong, or when additional features of the API are needed, developers find themselves back in the weeds of the original API, trying to understand why their stream is "locked" or why releaseLock() didn't do what they expected or hunting down bottlenecks in code they don't control.
// 压入当前数，维持栈的递增特性
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Once we have that, we can write the component in any language that supports components. The right language will depend on what you’re building or what libraries you need to use. For this example, I’ll leave the implementation of the image decoder as an exercise for the reader.