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.
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新时代以来，以习近平同志为核心的党中央统筹中华民族伟大复兴战略全局和世界百年未有之大变局，作出一系列重大决策部署，无不蕴含着“坚持从实际出发、按规律办事”的高超智慧。