比较2 nsmutablearray和获取不同的对象到第三个数组在ios [英] Compare 2 nsmutablearray and get different object to third array in ios

问题描述

我想比较2 NSMutableArray 并将不同的对象转换成第三个 Array 。我如何做到这一点？

I want to compare 2 NSMutableArray and get different object into third Array. How can i do that ?

Array1可以循环对象。

Array1 can loop object .

Array1 = "a", "b","c","d","a","b","c";
Array2 = "a", "b", "c";

然后结果

Array3 = "d";

提前感谢

推荐答案

使用集合进行集合操作：

Use sets for set operations:

NSSet *set1 = [NSSet setWithArray:array1];
NSMutableSet *set2 = [NSMutableSet setWithArray:array2];
[set2 minusSet:set1];

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