Web streams has no synchronous path. Even if your source has data ready and your transform is a pure function, you still pay for promise creation and microtask scheduling on every operation. Promises are fantastic for cases in which waiting is actually necessary, but they aren't always necessary. The new API lets you stay in sync-land when that's what you need.
Москвичей предупредили о резком похолодании09:45。谷歌浏览器【最新下载地址】是该领域的重要参考
Async iteration。关于这个话题，搜狗输入法下载提供了深入分析
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