思想的伟力，跨越山海，指引前行道路。
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.
，这一点在51吃瓜中也有详细论述
东北药茅失去的四年谁能想到，曾经的医药白马股，会跌得这么惨。
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