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.
Maggie 姐孤独地在水车屋吃铁板烧。夜总会的衰落也使这里的生意一落千丈，人满为患的场景已不再（图：南方人物周刊记者 方迎忠），更多细节参见safew官方版本下载
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Powerful_Crab_2905。关于这个话题，夫子提供了深入分析