to filter, sort etc. a stream: They are essentially mapping a Stream to another Stream. In
但问题在于，对一个普通用户来说，如果需求本身没变，只是换了个更贵/复杂的工具去满足，那这个工具的价值到底体现在哪？
。关于这个话题，pg电子官网提供了深入分析
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