Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.
printf("排序后: ");，这一点在同城约会中也有详细论述
。业内人士推荐safew官方版本下载作为进阶阅读
Юлия Мискевич (Ночной линейный редактор)，更多细节参见safew官方下载
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