用過Swift的讀者想必對map和flatMap不陌生，它們定義在SequenceType協(xié)議及其extension中，講它們用法的文章一大堆，...
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用過Swift的讀者想必對map和flatMap不陌生，它們定義在SequenceType協(xié)議及其extension中，講它們用法的文章一大堆，...
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