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.
接棒者的挑战虽然刘建军行长奠定了一份坚实的家底，但邮储银行未来的难题仍不少，也是接棒者面临的考验。
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Speaking to the BBC in 2012 during a London trip to perform a piano concerto at Royal Albert Hall, he said he planned to give a show to people "who are not used to going to a serious concert".