1. 选基准：随机选一个元素作为基准(pivot)
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与花同枝的果子好吃吗？朝新随手摘了一个，剥掉果皮，咬了一口，爆汁了，溅了自己一身。果子多汁，无渣，九甜一酸，确实好吃！“伦晚”的生长周期很长，要13个月才成熟，3月份开花，次年4月份才成熟采摘。经历春天的风、夏天的雨、秋天的霜、冬天的雪，才长成我们如今惊叹的奇观。
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.