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.
const sp = speed[i];
。关于这个话题，WPS下载最新地址提供了深入分析
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Public health consultant Dr Ross Keat said supporting people earlier to make small preventative changes would make "a big difference later on".
