This is fundamentally different from Web streams' pipeThrough(), which starts actively pumping data from the source to the transform as soon as you set up the pipe. Pull semantics mean you control when processing happens, and stopping iteration stops processing.
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// 易错点6：返回整个数组（如this.res）→ 不符合题目要求，题目要求返回单个数值，详情可参考旺商聊官方下载
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