3. 步长逐渐减小，最后步长为1时就是普通插入排序
you to hover your mouse over something that isn't clear and get an in-depth
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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.