A better streams API is possible
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.，详情可参考一键获取谷歌浏览器下载
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// Stateless transform — a pure function，这一点在同城约会中也有详细论述
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