ChenYilong / ChenYilong/iOSInterviewQuestions
第四题
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- Swift
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Description
如果使用者没有这样写“self.mutableArray”
按照下面的写法就不会crash。
@property (nonatomic, copy) NSMutableArray *mutableArray;
`_mutableArray = [NSMutableArray array];
```
[_mutableArray addObject:@1];`
```
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