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swift-topics

什么是 copy on write？

写时复制，指的是 swift 中的值类型，并不会在一开始赋值的时候就去复制，只有在需要修改的时候才去复制。

详细说明

class 和 struct 的区别？

class 为类，struct 为结构体，类是引用类型，结构体为值类型，结构体不可以继承。

Set 独有的方法有哪些？

  1. union(_:): Set 取并集

  2. intersection(_:): Set 取交集

  3. symmetricDifference(_:): Set 取差集

  4. subtracting(_:): Set 取对称差集

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