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习题链接：LeetCode 1475. 商品折扣后的最终价格
，推荐阅读搜狗输入法下载获取更多信息
最重要的是，这套打法能迅速占领用户心智，从精神产品到拿到手的商品，全面占领。
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.
Mark SavageMusic correspondent