The new API has complete parallel sync versions: Stream.pullSync(), Stream.bytesSync(), Stream.textSync(), and so on. If your source and transforms are all synchronous, you can process the entire pipeline without a single promise.
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，这一点在91视频中也有详细论述
需要元素值：栈存值，或答案存索引后用 nums[res[i]] 取值。。关于这个话题，雷电模拟器官方版本下载提供了深入分析
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await dropOld.writer.write(chunk3); // ok, chunk1 discarded