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.
This is fundamentally different from Web streams' pipeThrough(), which starts actively pumping data from the source to the transform as soon as you set up the pipe. Pull semantics mean you control when processing happens, and stopping iteration stops processing.，详情可参考heLLoword翻译官方下载
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* 时间复杂度: O(n²) 最好: O(n) 空间复杂度: O(1) 稳定: ✓。同城约会对此有专业解读
看起来，苹果似乎真的没必要给 MacBook 装上一个触控屏——只是，时代变了。